BEGIN /tmp/ffconf.2E16z1Vk.c
    1   #include <x264.h>
    2   int x;
END /tmp/ffconf.2E16z1Vk.c
x86_64-w64-mingw32-gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -U__STRICT_ANSI__ -D__USE_MINGW_ANSI_STDIO=1 -D__printf__=__gnu_printf__ -DPIC -std=c99 -E -o /tmp/ffconf.lQEw1w4m.o /tmp/ffconf.2E16z1Vk.c
/tmp/ffconf.2E16z1Vk.c:1:18: fatal error: x264.h: No such file or directory
 #include <x264.h>
                  ^
compilation terminated.
ERROR: libx264 not found

anshul@green /cygdrive/c/Users/anshul/Project/ffmpeg
$ pkg-config.exe --cflags x264
-I/usr/local/include

anshul@green /cygdrive/c/Users/anshul/Project/ffmpeg
$ ls /usr/local/include/x264
x264.h         x264_config.h

anshul@green /cygdrive/c/Users/anshul/Project/ffmpeg
$ ls /usr/local/include/x264.h
/usr/local/include/x264.h

anshul@green /cygdrive/c/Users/anshul/Project/ffmpeg