BEGIN /tmp/ffconf.ecAvfo0V/test.c
    1	#include <ass/ass.h>
    2	#include <stdint.h>
    3	long check_ass_library_init(void) { return (long) ass_library_init; }
    4	int main(void) { int ret = 0;
    5	 ret |= ((intptr_t)check_ass_library_init) & 0xFFFF;
    6	return ret; }
END /tmp/ffconf.ecAvfo0V/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/home/jeebus/ffmpeg_build/include -std=c11 -fomit-frame-pointer -fPIC -pthread -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/fribidi -I/usr/include/freetype2 -pthread -pthread -c -o /tmp/ffconf.ecAvfo0V/test.o /tmp/ffconf.ecAvfo0V/test.c
gcc -L/home/jeebus/ffmpeg_build/lib -Wl,--as-needed -Wl,-z,noexecstack -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/fribidi -I/usr/include/freetype2 -pthread -pthread -o /tmp/ffconf.ecAvfo0V/test /tmp/ffconf.ecAvfo0V/test.o -lass -lm -lharfbuzz -lglib-2.0 -lpcre -lgraphite2 -lfontconfig -lexpat -lfreetype -lexpat -lfribidi -lfreetype -lz -lpng16 -lm -lz -lm -lpthread -lm
/usr/bin/ld: cannot find -lpng16
collect2: error: ld returned 1 exit status
ERROR: libass not found using pkg-config