Unable to build on MSYS2 (CLANG64)

[ghost]

$ ninja -j1
[1/72] Building C object gear-lib/libposix/CMakeFiles/posix.dir/libposix.c.obj
FAILED: gear-lib/libposix/CMakeFiles/posix.dir/libposix.c.obj
C:\msys64\clang64\bin\cc.exe  -IC:/msys64/home/Administrator/gear-lib/gear-lib/libposix/. -IC:/msys64/home/Administrator/gear-lib/gear-lib/libposix/pthreads4w -IC:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include  -MD -MT gear-lib/libposix/CMakeFiles/posix.dir/libposix.c.obj -MF gear-lib\libposix\CMakeFiles\posix.dir\libposix.c.obj.d -o gear-lib/libposix/CMakeFiles/posix.dir/libposix.c.obj -c C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/libposix.c
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/libposix.c:23:
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/./libposix.h:45:
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/./libposix4win.h:25:
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:34:2: error: The msvclibx library is designed for use with the Microsoft Visual C/C++ tools only.
#error The msvclibx library is designed for use with the Microsoft Visual C/C++ tools only.
 ^
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:48:6: error: No msvclibx.lib version for this 64-bits OS.
#    error No msvclibx.lib version for this 64-bits OS.
     ^
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/libposix.c:23:
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/./libposix.h:45:
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/./libposix4win.h:27:
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/stdio.h:33:10: error: pasting formed '/stdio', an invalid preprocessing token
#include UCRT_INCLUDE_FILE(stdio.h) /* Include MSVC's own <stdio.h> file */
         ^
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:128:83: note: expanded from macro 'UCRT_INCLUDE_FILE'
#define UCRT_INCLUDE_FILE(relpath) MSVCLIBX_STRINGIZE(MSVCLIBX_CONCAT(UCRTINCLUDE,MSVCLIBX_CONCAT(/,relpath))) /* C runtime library include files */
                                                                                  ^
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:123:30: note: expanded from macro 'MSVCLIBX_CONCAT'
#define MSVCLIBX_CONCAT(a,b) MSVCLIBX_CONCAT1(a,b) /* Substitute the arguments, then concatenate the values */
                             ^
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:122:32: note: expanded from macro 'MSVCLIBX_CONCAT1'
#define MSVCLIBX_CONCAT1(a,b) a##b /* Concatenate the raw arguments */
                               ^
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/libposix.c:23:
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/./libposix.h:45:
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/./libposix4win.h:27:
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/stdio.h:33:10: error: pasting formed 'UCRTINCLUDE/', an invalid preprocessing token
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:128:55: note: expanded from macro 'UCRT_INCLUDE_FILE'
#define UCRT_INCLUDE_FILE(relpath) MSVCLIBX_STRINGIZE(MSVCLIBX_CONCAT(UCRTINCLUDE,MSVCLIBX_CONCAT(/,relpath))) /* C runtime library include files */
                                                      ^
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:123:30: note: expanded from macro 'MSVCLIBX_CONCAT'
#define MSVCLIBX_CONCAT(a,b) MSVCLIBX_CONCAT1(a,b) /* Substitute the arguments, then concatenate the values */
                             ^
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:122:32: note: expanded from macro 'MSVCLIBX_CONCAT1'
#define MSVCLIBX_CONCAT1(a,b) a##b /* Concatenate the raw arguments */
                               ^
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/libposix.c:23:
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/./libposix.h:45:
In file included from C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/./libposix4win.h:27:
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/stdio.h:33:10: fatal error: 'UCRTINCLUDE/stdio.h' file not found
#include UCRT_INCLUDE_FILE(stdio.h) /* Include MSVC's own <stdio.h> file */
         ^~~~~~~~~~~~~~~~~~~~~~~~~~
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:128:36: note: expanded from macro 'UCRT_INCLUDE_FILE'
#define UCRT_INCLUDE_FILE(relpath) MSVCLIBX_STRINGIZE(MSVCLIBX_CONCAT(UCRTINCLUDE,MSVCLIBX_CONCAT(/,relpath))) /* C runtime library include files */
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:125:31: note: expanded from macro 'MSVCLIBX_STRINGIZE'
#define MSVCLIBX_STRINGIZE(x) MSVCLIBX_STRINGIZE1(x) /* Substitute the argument, then convert its value to a string */
                              ^~~~~~~~~~~~~~~~~~~~~~
C:/msys64/home/Administrator/gear-lib/gear-lib/libposix/MsvcLibX/include/msvclibx.h:124:32: note: expanded from macro 'MSVCLIBX_STRINGIZE1'
#define MSVCLIBX_STRINGIZE1(x) #x /* Convert the raw argument to a string */
                               ^~
<scratch space>:4:1: note: expanded from here
"UCRTINCLUDE/stdio.h"
^~~~~~~~~~~~~~~~~~~~~
5 errors generated.
ninja: build stopped: subcommand failed.

[gozfree]

already fix it, update and try it