Hello all,

I have never compiled FFmpeg and have zero knowledge nor experience with the 
process; I use 32bit FFmpeg version 4.1.6 on a 32bit raspberry pi, I wanted to 
use h264_v4l2m2m for hardware-accelerated encoding using 64 bit FFmpeg v4.3 
instead of the 32bit h264_omx, my steps were as follow:

I updated the PI to 64bit, now running:
Linux Dev 5.4.79-v8+ #1373 SMP PREEMPT Mon Nov 23 13:32:41 GMT 2020 aarch64 
GNU/Linux

I then cloned the FFmpeg:
git clone --depth 1 --branch release/4.3 https://github.com/FFmpeg/FFmpeg.git

and lastly, I have configured and ran the script with the following parameters:
sudo ./configure   --prefix="$HOME/ffmpeg_build"   
--pkg-config-flags="--static"   --extra-cflags="-I$HOME/ffmpeg_build/include"   
--extra-ldflags="-L$HOME/ffmpeg_build/lib"   --extra-libs="-lpthread -lm"   
--bindir="$HOME/bin"   --enable-gpl   --enable-gnutls   --enable-libaom   
--enable-libass   --enable-libfdk-aac   --enable-libfreetype   
--enable-libmp3lame   --enable-libopus   --enable-libvorbis   --enable-libvpx   
--enable-libx264   --enable-libx265   --enable-nonfree   --arch=aarch64   
--enable-libxml2   --enable-libwebp   --enable-libdrm
install prefix            /home/pi/ffmpeg_build
source path               .
C compiler                gcc
C library                 glibc
ARCH                      aarch64 (generic)
big-endian                no
runtime cpu detection     yes
NEON enabled              no
VFP enabled               no
debug symbols             yes
strip symbols             yes
optimize for size         no
optimizations             yes
static                    yes
shared                    no
postprocessing support    yes
network support           yes
threading support         pthreads
safe bitstream reader     yes
texi2html enabled         no
perl enabled              yes
pod2man enabled           yes
makeinfo enabled          yes
makeinfo supports HTML    yes

External libraries:
alsa                    libdrm                  libvorbis               libxcb  
                lzma
gnutls                  libfdk_aac              libvpx                  
libxcb_shape            sdl2
iconv                   libfreetype             libwebp                 
libxcb_shm              sndio
libaom                  libmp3lame              libx264                 
libxcb_xfixes           xlib
libass                  libopus                 libx265                 libxml2 
                zlib

External libraries providing hardware acceleration:
v4l2_m2m                vaapi                   vdpau

Libraries:
avcodec                 avfilter                avutil                  
swresample
avdevice                avformat                postproc                swscale

Programs:
ffmpeg                  ffplay                  ffprobe

Enabled decoders:
aac                     atrac9                  flic                    mp3     
                pgm                     truemotion2
aac_fixed               aura                    flv                     mp3adu  
                pgmyuv                  truemotion2rt
aac_latm                aura2                   fmvc                    
mp3adufloat             pgssub                  truespeech
aasc                    avrn                    fourxm                  
mp3float                pictor                  tscc
ac3                     avrp                    fraps                   mp3on4  
                pixlet                  tscc2
ac3_fixed               avs                     frwu                    
mp3on4float             pjs                     tta
acelp_kelvin            avui                    g2m                     mpc7    
                png                     twinvq
adpcm_4xm               ayuv                    g723_1                  mpc8    
                ppm                     txd
adpcm_adx               bethsoftvid             g729                    
mpeg1_v4l2m2m           prores                  ulti
adpcm_afc               bfi                     gdv                     
mpeg1video              prosumer                utvideo
adpcm_agm               bink                    gif                     
mpeg2_v4l2m2m           psd                     v210
adpcm_aica              binkaudio_dct           gremlin_dpcm            
mpeg2video              ptx                     v210x
adpcm_argo              binkaudio_rdft          gsm                     mpeg4   
                qcelp                   v308
adpcm_ct                bintext                 gsm_ms                  
mpeg4_v4l2m2m           qdm2                    v408
adpcm_dtk               bitpacked               h261                    
mpegvideo               qdmc                    v410
adpcm_ea                bmp                     h263                    mpl2    
                qdraw                   vb
adpcm_ea_maxis_xa       bmv_audio               h263_v4l2m2m            msa1    
                qpeg                    vble
adpcm_ea_r1             bmv_video               h263i                   mscc    
                qtrle                   vc1
adpcm_ea_r2             brender_pix             h263p                   
msmpeg4v1               r10k                    vc1_v4l2m2m
adpcm_ea_r3             c93                     h264                    
msmpeg4v2               r210                    vc1image
adpcm_ea_xas            cavs                    h264_v4l2m2m            
msmpeg4v3               ra_144                  vcr1
adpcm_g722              ccaption                hap                     msrle   
                ra_288                  vmdaudio
adpcm_g726              cdgraphics              hca                     mss1    
                ralf                    vmdvideo
adpcm_g726le            cdtoons                 hcom                    mss2    
                rasc                    vmnc
adpcm_ima_alp           cdxl                    hevc                    
msvideo1                rawvideo                vorbis
adpcm_ima_amv           cfhd                    hevc_v4l2m2m            mszh    
                realtext                vp3
adpcm_ima_apc           cinepak                 hnm4_video              mts2    
                rl2                     vp4
adpcm_ima_apm           clearvideo              hq_hqa                  mv30    
                roq                     vp5
adpcm_ima_cunning       cljr                    hqx                     mvc1    
                roq_dpcm                vp6
adpcm_ima_dat4          cllc                    huffyuv                 mvc2    
                rpza                    vp6a
adpcm_ima_dk3           comfortnoise            hymt                    mvdv    
                rscc                    vp6f
adpcm_ima_dk4           cook                    iac                     mvha    
                rv10                    vp7
adpcm_ima_ea_eacs       cpia                    idcin                   mwsc    
                rv20                    vp8
adpcm_ima_ea_sead       cscd                    idf                     mxpeg   
                rv30                    vp8_v4l2m2m
adpcm_ima_iss           cyuv                    iff_ilbm                
nellymoser              rv40                    vp9
adpcm_ima_mtf           dca                     ilbc                    notchlc 
                s302m                   vp9_v4l2m2m
adpcm_ima_oki           dds                     imc                     nuv     
                sami                    vplayer
adpcm_ima_qt            derf_dpcm               imm4                    on2avc  
                sanm                    vqa
adpcm_ima_rad           dfa                     imm5                    opus    
                sbc                     wavpack
adpcm_ima_smjpeg        dirac                   indeo2                  
paf_audio               scpr                    wcmv
adpcm_ima_ssi           dnxhd                   indeo3                  
paf_video               screenpresso            webp
adpcm_ima_wav           dolby_e                 indeo4                  pam     
                sdx2_dpcm               webvtt
adpcm_ima_ws            dpx                     indeo5                  pbm     
                sgi                     wmalossless
adpcm_ms                dsd_lsbf                interplay_acm           
pcm_alaw                sgirle                  wmapro
adpcm_mtaf              dsd_lsbf_planar         interplay_dpcm          
pcm_bluray              sheervideo              wmav1
adpcm_psx               dsd_msbf                interplay_video         pcm_dvd 
                shorten                 wmav2
adpcm_sbpro_2           dsd_msbf_planar         jacosub                 
pcm_f16le               sipr                    wmavoice
adpcm_sbpro_3           dsicinaudio             jpeg2000                
pcm_f24le               siren                   wmv1
adpcm_sbpro_4           dsicinvideo             jpegls                  
pcm_f32be               smackaud                wmv2
adpcm_swf               dss_sp                  jv                      
pcm_f32le               smacker                 wmv3
adpcm_thp               dst                     kgv1                    
pcm_f64be               smc                     wmv3image
adpcm_thp_le            dvaudio                 kmvc                    
pcm_f64le               smvjpeg                 wnv1
adpcm_vima              dvbsub                  lagarith                pcm_lxf 
                snow                    wrapped_avframe
adpcm_xa                dvdsub                  libaom_av1              
pcm_mulaw               sol_dpcm                ws_snd1
adpcm_yamaha            dvvideo                 libfdk_aac              
pcm_s16be               sonic                   xan_dpcm
adpcm_zork              dxa                     libopus                 
pcm_s16be_planar        sp5x                    xan_wc3
agm                     dxtory                  libvorbis               
pcm_s16le               speedhq                 xan_wc4
aic                     dxv                     libvpx_vp8              
pcm_s16le_planar        srgc                    xbin
alac                    eac3                    libvpx_vp9              
pcm_s24be               srt                     xbm
alias_pix               eacmv                   loco                    
pcm_s24daud             ssa                     xface
als                     eamad                   lscr                    
pcm_s24le               stl                     xl
amrnb                   eatgq                   m101                    
pcm_s24le_planar        subrip                  xma1
amrwb                   eatgv                   mace3                   
pcm_s32be               subviewer               xma2
amv                     eatqi                   mace6                   
pcm_s32le               subviewer1              xpm
anm                     eightbps                magicyuv                
pcm_s32le_planar        sunrast                 xsub
ansi                    eightsvx_exp            mdec                    
pcm_s64be               svq1                    xwd
ape                     eightsvx_fib            metasound               
pcm_s64le               svq3                    y41p
apng                    escape124               microdvd                pcm_s8  
                tak                     ylc
aptx                    escape130               mimic                   
pcm_s8_planar           targa                   yop
aptx_hd                 evrc                    mjpeg                   
pcm_u16be               targa_y216              yuv4
arbc                    exr                     mjpegb                  
pcm_u16le               tdsc                    zero12v
ass                     ffv1                    mlp                     
pcm_u24be               text                    zerocodec
asv1                    ffvhuff                 mmvideo                 
pcm_u24le               theora                  zlib
asv2                    ffwavesynth             motionpixels            
pcm_u32be               thp                     zmbv
atrac1                  fic                     movtext                 
pcm_u32le               tiertexseqvideo
atrac3                  fits                    mp1                     pcm_u8  
                tiff
atrac3al                flac                    mp1float                
pcm_vidc                tmv
atrac3p                 flashsv                 mp2                     pcx     
                truehd
atrac3pal               flashsv2                mp2float                pfm     
                truemotion1

Enabled encoders:
a64multi                comfortnoise            libmp3lame              
pcm_alaw                pcx                     tiff
a64multi5               dca                     libopus                 pcm_dvd 
                pgm                     truehd
aac                     dnxhd                   libvorbis               
pcm_f32be               pgmyuv                  tta
ac3                     dpx                     libvpx_vp8              
pcm_f32le               png                     utvideo
ac3_fixed               dvbsub                  libvpx_vp9              
pcm_f64be               ppm                     v210
adpcm_adx               dvdsub                  libwebp                 
pcm_f64le               prores                  v308
adpcm_g722              dvvideo                 libwebp_anim            
pcm_mulaw               prores_aw               v408
adpcm_g726              eac3                    libx264                 
pcm_s16be               prores_ks               v410
adpcm_g726le            ffv1                    libx264rgb              
pcm_s16be_planar        qtrle                   vc2
adpcm_ima_qt            ffvhuff                 libx265                 
pcm_s16le               r10k                    vorbis
adpcm_ima_ssi           fits                    ljpeg                   
pcm_s16le_planar        r210                    vp8_v4l2m2m
adpcm_ima_wav           flac                    magicyuv                
pcm_s24be               ra_144                  vp8_vaapi
adpcm_ms                flashsv                 mjpeg                   
pcm_s24daud             rawvideo                vp9_vaapi
adpcm_swf               flashsv2                mjpeg_vaapi             
pcm_s24le               roq                     wavpack
adpcm_yamaha            flv                     mlp                     
pcm_s24le_planar        roq_dpcm                webvtt
alac                    g723_1                  movtext                 
pcm_s32be               rv10                    wmav1
alias_pix               gif                     mp2                     
pcm_s32le               rv20                    wmav2
amv                     h261                    mp2fixed                
pcm_s32le_planar        s302m                   wmv1
apng                    h263                    mpeg1video              
pcm_s64be               sbc                     wmv2
aptx                    h263_v4l2m2m            mpeg2_vaapi             
pcm_s64le               sgi                     wrapped_avframe
aptx_hd                 h263p                   mpeg2video              pcm_s8  
                snow                    xbm
ass                     h264_v4l2m2m            mpeg4                   
pcm_s8_planar           sonic                   xface
asv1                    h264_vaapi              mpeg4_v4l2m2m           
pcm_u16be               sonic_ls                xsub
asv2                    hevc_v4l2m2m            msmpeg4v2               
pcm_u16le               srt                     xwd
avrp                    hevc_vaapi              msmpeg4v3               
pcm_u24be               ssa                     y41p
avui                    huffyuv                 msvideo1                
pcm_u24le               subrip                  yuv4
ayuv                    jpeg2000                nellymoser              
pcm_u32be               sunrast                 zlib
bmp                     jpegls                  opus                    
pcm_u32le               svq1                    zmbv
cinepak                 libaom_av1              pam                     pcm_u8  
                targa
cljr                    libfdk_aac              pbm                     
pcm_vidc                text

Enabled hwaccels:
h263_vaapi              hevc_vaapi              mpeg1_vdpau             
mpeg4_vaapi             vc1_vdpau               wmv3_vaapi
h264_vaapi              hevc_vdpau              mpeg2_vaapi             
mpeg4_vdpau             vp8_vaapi               wmv3_vdpau
h264_vdpau              mjpeg_vaapi             mpeg2_vdpau             
vc1_vaapi               vp9_vaapi

Enabled parsers:
aac                     cook                    dvdsub                  h264    
                opus                    vc1
aac_latm                dca                     flac                    hevc    
                png                     vorbis
ac3                     dirac                   g723_1                  
jpeg2000                pnm                     vp3
adx                     dnxhd                   g729                    mjpeg   
                rv30                    vp8
av1                     dpx                     gif                     mlp     
                rv40                    vp9
avs2                    dvaudio                 gsm                     
mpeg4video              sbc                     webp
bmp                     dvbsub                  h261                    
mpegaudio               sipr                    xma
cavsvideo               dvd_nav                 h263                    
mpegvideo               tak

Enabled demuxers:
aa                      codec2                  hls                     lrc     
                pcm_s24le               srt
aac                     codec2raw               hnm                     lvf     
                pcm_s32be               stl
ac3                     concat                  ico                     lxf     
                pcm_s32le               str
acm                     dash                    idcin                   m4v     
                pcm_s8                  subviewer
act                     data                    idf                     
matroska                pcm_u16be               subviewer1
adf                     daud                    iff                     mgsts   
                pcm_u16le               sup
adp                     dcstr                   ifv                     
microdvd                pcm_u24be               svag
ads                     derf                    ilbc                    mjpeg   
                pcm_u24le               swf
adx                     dfa                     image2                  
mjpeg_2000              pcm_u32be               tak
aea                     dhav                    image2_alias_pix        mlp     
                pcm_u32le               tedcaptions
afc                     dirac                   image2_brender_pix      mlv     
                pcm_u8                  thp
aiff                    dnxhd                   image2pipe              mm      
                pcm_vidc                threedostr
aix                     dsf                     image_bmp_pipe          mmf     
                pjs                     tiertexseq
alp                     dsicin                  image_dds_pipe          mov     
                pmp                     tmv
amr                     dss                     image_dpx_pipe          mp3     
                pp_bnk                  truehd
amrnb                   dts                     image_exr_pipe          mpc     
                pva                     tta
amrwb                   dtshd                   image_gif_pipe          mpc8    
                pvf                     tty
anm                     dv                      image_j2k_pipe          mpegps  
                qcp                     txd
apc                     dvbsub                  image_jpeg_pipe         mpegts  
                r3d                     ty
ape                     dvbtxt                  image_jpegls_pipe       
mpegtsraw               rawvideo                v210
apm                     dxa                     image_pam_pipe          
mpegvideo               realtext                v210x
apng                    ea                      image_pbm_pipe          mpjpeg  
                redspark                vag
aptx                    ea_cdata                image_pcx_pipe          mpl2    
                rl2                     vc1
aptx_hd                 eac3                    image_pgm_pipe          mpsub   
                rm                      vc1t
aqtitle                 epaf                    image_pgmyuv_pipe       msf     
                roq                     vividas
argo_asf                ffmetadata              image_pictor_pipe       
msnwc_tcp               rpl                     vivo
asf                     filmstrip               image_png_pipe          mtaf    
                rsd                     vmd
asf_o                   fits                    image_ppm_pipe          mtv     
                rso                     vobsub
ass                     flac                    image_psd_pipe          musx    
                rtp                     voc
ast                     flic                    image_qdraw_pipe        mv      
                rtsp                    vpk
au                      flv                     image_sgi_pipe          mvi     
                s337m                   vplayer
av1                     fourxm                  image_sunrast_pipe      mxf     
                sami                    vqf
avi                     frm                     image_svg_pipe          mxg     
                sap                     w64
avr                     fsb                     image_tiff_pipe         nc      
                sbc                     wav
avs                     fwse                    image_webp_pipe         
nistsphere              sbg                     wc3
avs2                    g722                    image_xpm_pipe          nsp     
                scc                     webm_dash_manifest
bethsoftvid             g723_1                  image_xwd_pipe          nsv     
                sdp                     webvtt
bfi                     g726                    ingenient               nut     
                sdr2                    wsaud
bfstm                   g726le                  ipmovie                 nuv     
                sds                     wsd
bink                    g729                    ircam                   ogg     
                sdx                     wsvqa
bintext                 gdv                     iss                     oma     
                segafilm                wtv
bit                     genh                    iv8                     paf     
                ser                     wv
bmv                     gif                     ivf                     
pcm_alaw                shorten                 wve
boa                     gsm                     ivr                     
pcm_f32be               siff                    xa
brstm                   gxf                     jacosub                 
pcm_f32le               sln                     xbin
c93                     h261                    jv                      
pcm_f64be               smacker                 xmv
caf                     h263                    kux                     
pcm_f64le               smjpeg                  xvag
cavsvideo               h264                    kvag                    
pcm_mulaw               smush                   xwma
cdg                     hca                     live_flv                
pcm_s16be               sol                     yop
cdxl                    hcom                    lmlm4                   
pcm_s16le               sox                     yuv4mpegpipe
cine                    hevc                    loas                    
pcm_s24be               spdif

Enabled muxers:
a64                     dts                     ico                     
mpeg2dvd                pcm_s8                  srt
ac3                     dv                      ilbc                    
mpeg2svcd               pcm_u16be               stream_segment
adts                    eac3                    image2                  
mpeg2video              pcm_u16le               streamhash
adx                     f4v                     image2pipe              
mpeg2vob                pcm_u24be               sup
aiff                    ffmetadata              ipod                    mpegts  
                pcm_u24le               swf
amr                     fifo                    ircam                   mpjpeg  
                pcm_u32be               tee
apng                    fifo_test               ismv                    mxf     
                pcm_u32le               tg2
aptx                    filmstrip               ivf                     mxf_d10 
                pcm_u8                  tgp
aptx_hd                 fits                    jacosub                 
mxf_opatom              pcm_vidc                truehd
asf                     flac                    kvag                    null    
                psp                     tta
asf_stream              flv                     latm                    nut     
                rawvideo                uncodedframecrc
ass                     framecrc                lrc                     oga     
                rm                      vc1
ast                     framehash               m4v                     ogg     
                roq                     vc1t
au                      framemd5                matroska                ogv     
                rso                     voc
avi                     g722                    matroska_audio          oma     
                rtp                     w64
avm2                    g723_1                  md5                     opus    
                rtp_mpegts              wav
avs2                    g726                    microdvd                
pcm_alaw                rtsp                    webm
bit                     g726le                  mjpeg                   
pcm_f32be               sap                     webm_chunk
caf                     gif                     mkvtimestamp_v2         
pcm_f32le               sbc                     webm_dash_manifest
cavsvideo               gsm                     mlp                     
pcm_f64be               scc                     webp
codec2                  gxf                     mmf                     
pcm_f64le               segafilm                webvtt
codec2raw               h261                    mov                     
pcm_mulaw               segment                 wtv
crc                     h263                    mp2                     
pcm_s16be               singlejpeg              wv
dash                    h264                    mp3                     
pcm_s16le               smjpeg                  yuv4mpegpipe
data                    hash                    mp4                     
pcm_s24be               smoothstreaming
daud                    hds                     mpeg1system             
pcm_s24le               sox
dirac                   hevc                    mpeg1vcd                
pcm_s32be               spdif
dnxhd                   hls                     mpeg1video              
pcm_s32le               spx

Enabled protocols:
async                   file                    https                   prompeg 
                srtp                    udplite
cache                   ftp                     icecast                 rtmp    
                subfile                 unix
concat                  gopher                  md5                     rtmps   
                tcp
crypto                  hls                     mmsh                    rtmpt   
                tee
data                    http                    mmst                    rtmpts  
                tls
ffrtmphttp              httpproxy               pipe                    rtp     
                udp

Enabled filters:
abench                  asidedata               deflate                 hqdn3d  
                perspective             smartblur
abitscope               asoftclip               deflicker               hqx     
                phase                   smptebars
acompressor             asplit                  deinterlace_vaapi       hstack  
                photosensitivity        smptehdbars
acontrast               ass                     dejudder                hue     
                pixdesctest             sobel
acopy                   astats                  delogo                  
hwdownload              pixscope                spectrumsynth
acrossfade              astreamselect           denoise_vaapi           hwmap   
                pp                      split
acrossover              asubboost               derain                  
hwupload                pp7                     spp
acrusher                atadenoise              deshake                 
hysteresis              premultiply             sr
acue                    atempo                  despill                 idet    
                prewitt                 ssim
addroi                  atrim                   detelecine              il      
                procamp_vaapi           stereo3d
adeclick                avectorscope            dilation                inflate 
                pseudocolor             stereotools
adeclip                 avgblur                 displace                
interlace               psnr                    stereowiden
adelay                  axcorrelate             dnn_processing          
interleave              pullup                  streamselect
aderivative             bandpass                doubleweave             join    
                qp                      subtitles
adrawgraph              bandreject              drawbox                 
kerndeint               random                  super2xsai
aecho                   bass                    drawgraph               lagfun  
                readeia608              superequalizer
aemphasis               bbox                    drawgrid                
lenscorrection          readvitc                surround
aeval                   bench                   drawtext                life    
                realtime                swaprect
aevalsrc                bilateral               drmeter                 limiter 
                remap                   swapuv
afade                   biquad                  dynaudnorm              loop    
                removegrain             tblend
afftdn                  bitplanenoise           earwax                  
loudnorm                removelogo              telecine
afftfilt                blackdetect             ebur128                 lowpass 
                repeatfields            testsrc
afifo                   blackframe              edgedetect              
lowshelf                replaygain              testsrc2
afir                    blend                   elbg                    lumakey 
                reverse                 thistogram
afirsrc                 bm3d                    entropy                 lut     
                rgbashift               threshold
aformat                 boxblur                 eq                      lut1d   
                rgbtestsrc              thumbnail
agate                   bwdif                   equalizer               lut2    
                roberts                 tile
agraphmonitor           cas                     erosion                 lut3d   
                rotate                  tinterlace
ahistogram              cellauto                extractplanes           lutrgb  
                sab                     tlut2
aiir                    channelmap              extrastereo             lutyuv  
                scale                   tmedian
aintegral               channelsplit            fade                    
mandelbrot              scale2ref               tmix
ainterleave             chorus                  fftdnoiz                
maskedclamp             scale_vaapi             tonemap
alimiter                chromahold              fftfilt                 
maskedmax               scdet                   tonemap_vaapi
allpass                 chromakey               field                   
maskedmerge             scroll                  tpad
allrgb                  chromashift             fieldhint               
maskedmin               select                  transpose
allyuv                  ciescope                fieldmatch              
maskedthreshold         selectivecolor          transpose_vaapi
aloop                   codecview               fieldorder              maskfun 
                sendcmd                 treble
alphaextract            color                   fifo                    mcdeint 
                separatefields          tremolo
alphamerge              colorbalance            fillborders             
mcompand                setdar                  trim
amerge                  colorchannelmixer       find_rect               median  
                setfield                unpremultiply
ametadata               colorhold               firequalizer            
mergeplanes             setparams               unsharp
amix                    colorkey                flanger                 
mestimate               setpts                  untile
amovie                  colorlevels             floodfill               
metadata                setrange                uspp
amplify                 colormatrix             format                  
midequalizer            setsar                  v360
amultiply               colorspace              fps                     
minterpolate            settb                   vaguedenoiser
anequalizer             compand                 framepack               mix     
                sharpness_vaapi         vectorscope
anlmdn                  compensationdelay       framerate               movie   
                showcqt                 vflip
anlms                   concat                  framestep               
mpdecimate              showfreqs               vfrdet
anoisesrc               convolution             freezedetect            
mptestsrc               showinfo                vibrance
anull                   convolve                freezeframes            negate  
                showpalette             vibrato
anullsink               copy                    fspp                    nlmeans 
                showspatial             vignette
anullsrc                cover_rect              gblur                   nnedi   
                showspectrum            vmafmotion
apad                    crop                    geq                     
noformat                showspectrumpic         volume
aperms                  cropdetect              gradfun                 noise   
                showvolume              volumedetect
aphasemeter             crossfeed               gradients               
normalize               showwaves               vstack
aphaser                 crystalizer             graphmonitor            null    
                showwavespic            w3fdif
apulsator               cue                     greyedge                
nullsink                shuffleframes           waveform
arealtime               curves                  haas                    nullsrc 
                shuffleplanes           weave
aresample               datascope               haldclut                
oscilloscope            sidechaincompress       xbr
areverse                dblur                   haldclutsrc             overlay 
                sidechaingate           xfade
arnndn                  dcshift                 hdcd                    
owdenoise               sidedata                xmedian
aselect                 dctdnoiz                headphone               pad     
                sierpinski              xstack
asendcmd                deband                  hflip                   
pal100bars              signalstats             yadif
asetnsamples            deblock                 highpass                
pal75bars               signature               yaepblur
asetpts                 decimate                highshelf               
palettegen              silencedetect           yuvtestsrc
asetrate                deconvolve              hilbert                 
paletteuse              silenceremove           zoompan
asettb                  dedot                   histeq                  pan     
                sinc
ashowinfo               deesser                 histogram               perms   
                sine

Enabled bsfs:
aac_adtstoasc           dump_extradata          h264_redundant_pps      
mjpega_dump_header      null                    trace_headers
av1_frame_merge         eac3_core               hapqa_extract           
mov2textsub             opus_metadata           truehd_core
av1_frame_split         extract_extradata       hevc_metadata           
mp3_header_decompress   pcm_rechunk             vp9_metadata
av1_metadata            filter_units            hevc_mp4toannexb        
mpeg2_metadata          prores_metadata         vp9_raw_reorder
chomp                   h264_metadata           imx_dump_header         
mpeg4_unpack_bframes    remove_extradata        vp9_superframe
dca_core                h264_mp4toannexb        mjpeg2jpeg              noise   
                text2movsub             vp9_superframe_split

Enabled indevs:
alsa                    kmsgrab                 oss                     v4l2
fbdev                   lavfi                   sndio                   xcbgrab

Enabled outdevs:
alsa                    oss                     sndio                   xv
fbdev                   sdl2                    v4l2

License: nonfree and unredistributable
config.h is unchanged
libavutil/avconfig.h is unchanged
libavfilter/filter_list.c is unchanged
libavcodec/codec_list.c is unchanged
libavcodec/parser_list.c is unchanged
libavcodec/bsf_list.c is unchanged
libavformat/demuxer_list.c is unchanged
libavformat/muxer_list.c is unchanged
libavdevice/indev_list.c is unchanged
libavdevice/outdev_list.c is unchanged
libavformat/protocol_list.c is unchanged
ffbuild/config.sh is unchanged

///////////////////////////// END OF OUTPUT /////////////////////////////

The next part was trying to run the make command but here I have encountered 
the following errors:
pi@Dev:~/FFmpeg $ sudo make -j4
CC      libavfilter/vf_curves.o
CC      libavfilter/vf_edgedetect.o
CC      libavfilter/vf_elbg.o
CC      libavfilter/vf_entropy.o
CC      libavfilter/vf_eq.o
CC      libavfilter/vf_extractplanes.o
In file included from ./libavutil/bswap.h:38,
                 from ./libavutil/intreadwrite.h:25,
                 from libavfilter/vf_curves.c:25:
libavfilter/vf_curves.c: In function ‘parse_psfile’:
./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand for 
code 'w'
     __asm__("rev16 %w0, %w0" : "+r"(x));
     ^~~~~~~
./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand for 
code 'w'
./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand for 
code 'w'
     __asm__("rev16 %w0, %w0" : "+r"(x));
     ^~~~~~~
./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand for 
code 'w'
./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand for 
code 'w'
     __asm__("rev16 %w0, %w0" : "+r"(x));
     ^~~~~~~
./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand for 
code 'w'
./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand for 
code 'w'
     __asm__("rev16 %w0, %w0" : "+r"(x));
     ^~~~~~~
./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand for 
code 'w'
CC      libavfilter/vf_fade.o
CC      libavfilter/vf_fftdnoiz.o
CC      libavfilter/vf_fftfilt.o
make: *** [ffbuild/common.mak:59: libavfilter/vf_curves.o] Error 1
make: *** Waiting for unfinished jobs....

///////////////////////////// END OF OUTPUT /////////////////////////////

What is it that I miss in the process that prevents the make from running 
without those errors?

Thank you all in advance!
Cheers,
Ram
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