[FFmpeg-user] Building ffmpeg - pkgconfig, again

[Jeff]

Hi list,

I’ve read questions in the list archives about ffmpeg's build system 
reporting that pkg-config could not find this or that external library. 
I'm having the same issue: it can't find Opus, Vorbis, Theora, 
mp3lame... I've tried prepending 'lib' to ".pc" file names that didn't 
have that and other such tricks, but pkg-config isn't having any of it. 
I've seen advice to add extra cflags and ldflags that point to the 
desired libraries, but they have to be called with an '--enable-' 
statement (and pkg-config has to recognize them) or they do not get 
built in.

Here is the relevant portion of 'ffbuild/config.log' for Opus. Please 
can some experienced person help out with this?

Jeff

require_pkg_config libopus opus opus_multistream.h 
opus_multistream_decoder_create
check_pkg_config libopus opus opus_multistream.h 
opus_multistream_decoder_create
test_pkg_config libopus opus opus_multistream.h 
opus_multistream_decoder_create
pkg-config --exists --print-errors opus
check_func_headers opus_multistream.h opus_multistream_decoder_create 
-I/usr/local/include/opus -L/usr/local/lib -lopus
test_ld cc -I/usr/local/include/opus -L/usr/local/lib -lopus
test_cc -I/usr/local/include/opus -L/usr/local/lib
BEGIN /tmp/ffconf.9RG9c4YU/test.c
     1   #include <opus_multistream.h>
     2   #include <stdint.h>
     3   long check_opus_multistream_decoder_create(void) { return 
(long) opus_multistream_decoder_create; }
     4   int main(void) { int ret = 0;
     5    ret |= ((intptr_t)check_opus_multistream_decoder_create) & 0xFFFF;
     6   return ret; }
END /tmp/ffconf.9RG9c4YU/test.c
gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE 
-D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -g -O3 
-feliminate-unused-debug-types -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 
-fexceptions -fstack-protector --param=ssp-buffer-size=32 -Wformat 
-Wformat-security -Wl,--copy-dt-needed-entries -m64 
-fasynchronous-unwind-tables -Wp,-D_REENTRANT 
-ftree-loop-distribute-patterns -Wl,-z -Wl,now -Wl,-z -Wl,relro 
-fno-semantic-interposition -ffat-lto-objects -fno-signed-zeros 
-fno-trapping-math -fassociative-math -Wl,-sort-common 
-Wl,--enable-new-dtags -std=c11 -fomit-frame-pointer -pthread 
-I/usr/include/p11-kit-1 -I/usr/local/include/opus -L/usr/local/lib -c 
-o /tmp/ffconf.9RG9c4YU/test.o /tmp/ffconf.9RG9c4YU/test.c
gcc -Wl,--as-needed -Wl,-z,noexecstack -I/usr/local/include/opus 
-L/usr/local/lib -o /tmp/ffconf.9RG9c4YU/test 
/tmp/ffconf.9RG9c4YU/test.o -lopus
/usr/bin/ld: /usr/local/lib/libopus.a(opus_decoder.o): in function 
`opus_decode_frame':
/root/opus/../opus-1.3/src/opus_decoder.c:598: undefined reference to `exp'
/usr/bin/ld: /usr/local/lib/libopus.a(celt_decoder.o): in function 
`celt_decode_lost':
/root/opus/../opus-1.3/celt/celt_decoder.c:774: undefined reference to 
`sqrtf'
/usr/bin/ld: /root/opus/../opus-1.3/celt/celt_decoder.c:700: undefined 
reference to `sqrtf'
/usr/bin/ld: /usr/local/lib/libopus.a(mdct.o): in function `clt_mdct_init':
/root/opus/../opus-1.3/celt/mdct.c:98: undefined reference to `cos'
/usr/bin/ld: /usr/local/lib/libopus.a(modes.o): in function 
`opus_custom_mode_create':
/root/opus/../opus-1.3/celt/modes.c:376: undefined reference to `sin'
/usr/bin/ld: /root/opus/../opus-1.3/celt/modes.c:376: undefined 
reference to `sin'
/usr/bin/ld: /usr/local/lib/libopus.a(pitch.o): in function 
`compute_pitch_gain':
/root/opus/../opus-1.3/celt/pitch.c:426: undefined reference to `sqrtf'
/usr/bin/ld: /root/opus/../opus-1.3/celt/pitch.c:426: undefined 
reference to `sqrtf'
/usr/bin/ld: /usr/local/lib/libopus.a(quant_bands.o): in function 
`amp2Log2':
/root/opus/../opus-1.3/celt/quant_bands.c:553: undefined reference to `log'
/usr/bin/ld: /usr/local/lib/libopus.a(vq.o): in function `exp_rotation':
/root/opus/../opus-1.3/celt/vq.c:86: undefined reference to `cos'
/usr/bin/ld: /root/opus/../opus-1.3/celt/vq.c:87: undefined reference to 
`cos'
/usr/bin/ld: /root/opus/../opus-1.3/celt/vq.c:86: undefined reference to 
`cos'
/usr/bin/ld: /root/opus/../opus-1.3/celt/vq.c:87: undefined reference to 
`cos'
/usr/bin/ld: /root/opus/../opus-1.3/celt/vq.c:86: undefined reference to 
`cos'
/usr/bin/ld: 
/usr/local/lib/libopus.a(vq.o):/root/opus/../opus-1.3/celt/vq.c:87: more 
undefined references to `cos' follow
/usr/bin/ld: /usr/local/lib/libopus.a(vq.o): in function 
`normalise_residual':
/root/opus/../opus-1.3/celt/vq.c:131: undefined reference to `sqrtf'
/usr/bin/ld: /root/opus/../opus-1.3/celt/vq.c:131: undefined reference 
to `sqrtf'
/usr/bin/ld: /usr/local/lib/libopus.a(vq.o): in function 
`renormalise_vector':
/root/opus/../opus-1.3/celt/vq.c:394: undefined reference to `sqrtf'
/usr/bin/ld: /usr/local/lib/libopus.a(vq.o): in function `stereo_itheta':
/root/opus/../opus-1.3/celt/vq.c:429: undefined reference to `sqrtf'
/usr/bin/ld: /root/opus/../opus-1.3/celt/vq.c:428: undefined reference 
to `sqrtf'
/usr/bin/ld: 
/usr/local/lib/libopus.a(bands.o):/root/opus/../opus-1.3/celt/bands.c:400: 
more undefined references to `sqrtf' follow
/usr/bin/ld: /usr/local/lib/libopus.a(bands.o): in function `quant_band':
/root/opus/../opus-1.3/celt/bands.c:1225: undefined reference to `sqrt'
/usr/bin/ld: /usr/local/lib/libopus.a(bands.o): in function `stereo_merge':
/root/opus/../opus-1.3/celt/bands.c:458: undefined reference to `sqrtf'
/usr/bin/ld: /root/opus/../opus-1.3/celt/bands.c:456: undefined 
reference to `sqrtf'
/usr/bin/ld: /usr/local/lib/libopus.a(bands.o): in function 
`compute_band_energies':
/root/opus/../opus-1.3/celt/bands.c:169: undefined reference to `sqrtf'
/usr/bin/ld: /usr/local/lib/libopus.a(bands.o): in function 
`denormalise_bands':
/root/opus/../opus-1.3/celt/bands.c:230: undefined reference to `exp'
/usr/bin/ld: /usr/local/lib/libopus.a(bands.o): in function `anti_collapse':
/root/opus/../opus-1.3/celt/bands.c:299: undefined reference to `exp'
/usr/bin/ld: /root/opus/../opus-1.3/celt/bands.c:336: undefined 
reference to `exp'
/usr/bin/ld: /root/opus/../opus-1.3/celt/bands.c:300: undefined 
reference to `sqrt'
/usr/bin/ld: /usr/local/lib/libopus.a(kiss_fft.o): in function 
`compute_twiddles':
/root/opus/../opus-1.3/celt/kiss_fft.c:420: undefined reference to `sincos'
/usr/bin/ld: /root/opus/../opus-1.3/celt/kiss_fft.c:420: undefined 
reference to `sincos'
collect2: error: ld returned 1 exit status
ERROR: opus not found using pkg-config