编译ffmpeg，出现如下错误：
libavfilter/avf_showcqt.c:35:10: fatal error: ft2build.h: 没有那个文件或目录 #include <ft2build.h> ^~~~~~~~~~~~ compilation terminated. make: *** [ffbuild/common.mak:59：libavfilter/avf_showcqt.o] 错误 1
解决办法，修改ffbuild/common.mak：
# NASM requires -I path terminated with / IFLAGS := -I/home/quantum6/lib-build/include/SDL2 \ -I/home/quantum6/lib-build/include \ -I/home/quantum6/lib-build/include/freetype2 \ -I. -I$(SRC_LINK)/
