Hi Stefano,

>It's usually a library/header missing or not placed in the proper
>place.

>Read config.err, if you can't interpret it try to post its content
>here or on ffmpeg-user.

faac.h is missing. Isn't it included in FFMPEG source code. Is it an external 
suuport library/project?
I googled for the av_free function and I found this:

http://www.irisa.fr/texmex/people/dufouil/ffmpegdoxy/mem_8c.html

so I thought that the faac option should be enabled...

>Post the command which fails and the complete output

I got this:

OBJ.i686-pc-mingw32/gsd_img_mpeg.o: In function `gsd_close_mpeg':
C:/MSYS/local/src/grass-6.3.0/lib/ogsf/gsd_img_mpeg.c:182: undefined reference 
to `av_free'
C:/MSYS/local/src/grass-6.3.0/lib/ogsf/gsd_img_mpeg.c:183: undefined reference 
to `av_free'

>also which is
>the output of: pkg-config --libs libavformat?

sorry, I don't know how to do that! pkg-config is not a recognized command in 
MSYS/MinGW

Thanks

Marco
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