test_pkg_config gnutls gnutls gnutls/gnutls.h gnutls_global_init
pkg-config --exists --print-errors gnutls
check_func_headers gnutls/gnutls.h gnutls_global_init -I/usr/include/p11-kit-1 -lgnutls -lz -R/usr/lib/x86_64-linux-gnu -lp11-kit -lgmp -lhogweed -lgmp -lnettle -ltasn1 -lidn -lp11-kit -lz
test_ld cc -I/usr/include/p11-kit-1 -lgnutls -lz -R/usr/lib/x86_64-linux-gnu -lp11-kit -lgmp -lhogweed -lgmp -lnettle -ltasn1 -lidn -lp11-kit -lz
test_cc -I/usr/include/p11-kit-1 -R/usr/lib/x86_64-linux-gnu
BEGIN /tmp/ffconf.FcYIHvWQ/test.c
    1   #include <gnutls/gnutls.h>
    2   #include <stdint.h>
    3   long check_gnutls_global_init(void) { return (long) gnutls_global_init; }
    4   int main(void) { int ret = 0;
    5    ret |= ((intptr_t)check_gnutls_global_init) & 0xFFFF;
    6   return ret; }
END /tmp/ffconf.FcYIHvWQ/test.c
gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -I/root/ffmpeg_build/include -std=c11 -fomit-frame-pointer -fPIC -pthread -I/usr/include/p11-kit-1 -R/usr/lib/x86_64-linux-gnu -c -o /tmp/ffconf.FcYIHvWQ/test.o /tmp/ffconf.FcYIHvWQ/test.c
gcc: error: unrecognized command line option '-R'; did you mean '-R'?