libx264 not found FFmpeg? - windows

Question

I am trying to make a build of ffmpeg with libx264 enabled. However when I run the following command in MSYS
./configure --prefix=ffmpeg/ --enable-gpl --enable-libx264
I get an error saying
ERROR: libx264 not found
I am using MSYS on windows 10. I also have installed NASM. Here is the config.log file
BEGIN /tmp/ffconf.TRVJWfGe/test.c
1 #include <stdint.h>
2 #include <x264.h>
3 #include <stdint.h>
4 long check_x264_encoder_encode(void) { return (long) x264_encoder_encode; }
5 int main(void) { int ret = 0;
6 ret |= ((intptr_t)check_x264_encoder_encode) & 0xFFFF;
7 return ret; }
END /tmp/ffconf.TRVJWfGe/test.c
gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -U__STRICT_ANSI__ -D__USE_MINGW_ANSI_STDIO=1 -D__MSVCRT_VERSION__=0x0700 -D_WIN32_WINNT=0x0600 -D__printf__=__gnu_printf__ -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -std=c11 -fomit-frame-pointer -c -o /tmp/ffconf.TRVJWfGe/test.o /tmp/ffconf.TRVJWfGe/test.c
In file included from c:\mingw\include\stdint.h:46,
from c:\mingw\lib\gcc\mingw32\9.2.0\include\stdint.h:9,
from C:/Users/pawel/AppData/Local/Temp/ffconf.TRVJWfGe/test.c:1:
c:\mingw\include\_mingw.h:413:3: warning: #warning "Direct definition of __USE_MINGW_ANSI_STDIO is deprecated." [-Wcpp]
413 | # warning "Direct definition of __USE_MINGW_ANSI_STDIO is deprecated."
| ^~~~~~~
c:\mingw\include\_mingw.h:414:10: note: #pragma message: See <_mingw.h> for preferred feature activation methods.
414 | # pragma message "See <_mingw.h> for preferred feature activation methods."
| ^~~~~~~
C:/Users/pawel/AppData/Local/Temp/ffconf.TRVJWfGe/test.c:2:10: fatal error: x264.h: No such file or directory
2 | #include <x264.h>
| ^~~~~~~~
compilation terminated.
ERROR: libx264 not found
Could you tell me how to fix the error, or is there a prebuilt package with libx264 already inside?