Here is a patch for the ABI v2:

--- libav-9.10.orig/libavcodec/ppc/asm.S
+++ libav-9.10/libavcodec/ppc/asm.S
@@ -36,12 +36,20 @@

 .macro extfunc name
     .global X(\name)
+#if _CALL_ELF == 2
+    .text
+X(\name):
+    addis %r2,%r12,.TOC.-X(\name)@ha
+    addi %r2,%r2,.TOC.-X(\name)@l
+    .localentry (\name),-X(\name)
+#else
     .section .opd, "aw"
 X(\name):
     .quad L(\name), .TOC.@tocbase, 0
     .previous
     .type X(\name), STT_FUNC
 L(\name):
+#endif
 .endm

 .macro movrel rd, sym, gp

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https://bugs.launchpad.net/bugs/1263802

Title:
  FTBFS with altivec on ppc64el

Status in “libav” package in Ubuntu:
  New

Bug description:
  gcc -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample 
-Llibavutil -Llibswscale -Wl,-z,relro  -Wl,--as-needed -Wl,--warn-common 
-Wl,-rpath-link=libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample
  -o avconv avconv_opt.o avconv_filter.o avconv.o cmdutils.o  -lavdevice 
-lavfilter -lavformat -lavresample -lavcodec -lswscale -lavutil -ldl -lXfixes 
-lXext -lX11 -lcdio_paranoia -lcdio_cdda -lcdio -ljack -lasound -ldc1394 
-lraw1394 -lgcrypt -lxvidcore -lvpx -lvpx -lvorbisenc -lvorbis -logg 
-ltheoraenc -ltheoradec -logg -lspeex -lschroedinger-1.0 -lrtmp -lz -lgnutls 
-lpulse-simple -lpulse -lopus -lopenjpeg -lmp3lame -lgsm -lgnutls -lva -lm 
-pthread -lbz2 -lz  
  gcc -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample 
-Llibavutil -Llibswscale -Wl,-z,relro  -Wl,--as-needed -Wl,--warn-common 
-Wl,-rpath-link=libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample
  -o avplay avplay.o cmdutils.o  -lavdevice -lavfilter -lavformat -lavresample 
-lavcodec -lswscale -lavutil -ldl -lXfixes -lXext -lX11 -lcdio_paranoia 
-lcdio_cdda -lcdio -ljack -lasound -ldc1394 -lraw1394 -lgcrypt -lxvidcore -lvpx 
-lvpx -lvorbisenc -lvorbis -logg -ltheoraenc -ltheoradec -logg -lspeex 
-lschroedinger-1.0 -lrtmp -lz -lgnutls -lpulse-simple -lpulse -lopus -lopenjpeg 
-lmp3lame -lgsm -lgnutls -lva -lm -pthread -lbz2 -lz  -lSDL
  gcc -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample 
-Llibavutil -Llibswscale -Wl,-z,relro  -Wl,--as-needed -Wl,--warn-common 
-Wl,-rpath-link=libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample
  -o avprobe avprobe.o cmdutils.o  -lavdevice -lavfilter -lavformat 
-lavresample -lavcodec -lswscale -lavutil -ldl -lXfixes -lXext -lX11 
-lcdio_paranoia -lcdio_cdda -lcdio -ljack -lasound -ldc1394 -lraw1394 -lgcrypt 
-lxvidcore -lvpx -lvpx -lvorbisenc -lvorbis -logg -ltheoraenc -ltheoradec -logg 
-lspeex -lschroedinger-1.0 -lrtmp -lz -lgnutls -lpulse-simple -lpulse -lopus 
-lopenjpeg -lmp3lame -lgsm -lgnutls -lva -lm -pthread -lbz2 -lz  
  gcc -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavresample 
-Llibavutil -Llibswscale -Wl,-z,relro  -Wl,--as-needed -Wl,--warn-common 
-Wl,-rpath-link=libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample
 -Wl,-E -o avserver avserver.o cmdutils.o  -lavdevice -lavfilter -lavformat 
-lavresample -lavcodec -lswscale -lavutil -ldl -lXfixes -lXext -lX11 
-lcdio_paranoia -lcdio_cdda -lcdio -ljack -lasound -ldc1394 -lraw1394 -lgcrypt 
-lxvidcore -lvpx -lvpx -lvorbisenc -lvorbis -logg -ltheoraenc -ltheoradec -logg 
-lspeex -lschroedinger-1.0 -lrtmp -lz -lgnutls -lpulse-simple -lpulse -lopus 
-lopenjpeg -lmp3lame -lgsm -lgnutls -lva -lm -pthread -lbz2 -lz  
  /usr/bin/ld: libavcodec/libavcodec.a(fft_altivec_s.o): ABI version 1 is not 
compatible with ABI version 2 output
  /usr/bin/ld: failed to merge target specific data of file 
libavcodec/libavcodec.a(fft_altivec_s.o)
  collect2: error: ld returned 1 exit status
  make[1]: *** [avserver] Error 1

  
  Porting required?

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