[FFmpeg-user] Error building ffmpeg

[Paul Dam]

Hi, I'm trying to build ffmpeg 2.3.6 in a jail on nas4free 9.3.0.2. The
last couple of lines of config.log look like this:

-----
cc -L/usr/local/lib -Wl,--as-needed -Wl,-z,noexecstack
-I/usr/local/include/harfbuzz -I/usr/local/include/fribidi
-I/usr/local/include -I/usr/local/include/freetype2
-I/usr/local/include/libpng16 -L/usr/local/lib -o /tmp/ffconf.CSBieVOC
/tmp/ffconf.OLIDjMwQ.o -lass -lm -lbz2 -lz -pthread -pthread

/usr/local/lib/libass.so: undefined reference to `FT_Stroker_ParseOutline'

/usr/local/lib/libass.so: undefined reference to
`FT_Outline_GetOutsideBorder'

/usr/local/lib/libass.so: undefined reference to `FT_Stroker_Done'

/usr/local/lib/libass.so: undefined reference to
`FT_Stroker_GetBorderCounts'

/usr/local/lib/libass.so: undefined reference to `FT_Stroker_ExportBorder'

/usr/local/lib/libass.so: undefined reference to `FT_Stroker_Set'

/usr/local/lib/libass.so: undefined reference to `FT_Stroker_New'

ERROR: libass not found
-----

Anyone any ideas what's wrong here and what I need to do? Looking at the
errors I had thought the linker would also need the argument '-lfreetype',
but I have no clue where I can add that in the Makefile.

Thanks, Paul