Compilation Errors under MinGW

[digitalentropy]

In trying to compile under Windows, I've run into a couple of issues. Some I've been able to workaround, and some I have not.

The pkg-config seems to be unable to detect that libnfc is installed so I have to manually edit some library paths to point to the right /libnfc/include folder and all is well eventually.

err.h is not a supported header under Windows, but it doesn't seem to be actually used by nfc-iclass so commenting that out seems to resolve that issue, but this is the compilation error I cannot resolve:

nfc-iclass.h:2:6: error: conflicting types for 'strncasecmp'
    2 | bool strncasecmp(char *s1, char *s2, int len);
      |      ^~~~~~~~~~~
In file included from C:/msys64/mingw64/x86_64-w64-mingw32/include/io.h:10,
                 from C:/msys64/mingw64/x86_64-w64-mingw32/include/unistd.h:10,
                 from nfc-iclass.c:48:
C:/msys64/mingw64/x86_64-w64-mingw32/include/string.h:116:28: note: previous definition of 'strncasecmp' was here
  116 |   __CRT_INLINE int __cdecl strncasecmp (const char *__sz1, const char *__sz2, size_t __sizeMaxCompare) { return _strnicmp (__sz1, __sz2, __sizeMaxCompare); }
      |                            ^~~~~~~~~~~
nfc-iclass.c: In function 'main':
nfc-iclass.c:228:55: error: 'S_IRUSR' undeclared (first use in this function)
  228 |         if((outfile= open(optarg, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP)) <= 0)
      |                                                       ^~~~~~~
nfc-iclass.c:228:55: note: each undeclared identifier is reported only once for each function it appears in
nfc-iclass.c:228:65: error: 'S_IWUSR' undeclared (first use in this function)
  228 |         if((outfile= open(optarg, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP)) <= 0)
      |                                                                 ^~~~~~~
nfc-iclass.c:228:75: error: 'S_IRGRP' undeclared (first use in this function)
  228 |         if((outfile= open(optarg, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP)) <= 0)
      |                                                                           ^~~~~~~
nfc-iclass.c:228:85: error: 'S_IWGRP' undeclared (first use in this function)
  228 |         if((outfile= open(optarg, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP)) <= 0)
      |                                                                                     ^~~~~~~
nfc-iclass.c: At top level:
nfc-iclass.c:629:6: error: conflicting types for 'strncasecmp'
  629 | bool strncasecmp(char *s1, char *s2, int len)
      |      ^~~~~~~~~~~
In file included from C:/msys64/mingw64/x86_64-w64-mingw32/include/io.h:10,
                 from C:/msys64/mingw64/x86_64-w64-mingw32/include/unistd.h:10,
                 from nfc-iclass.c:48:
C:/msys64/mingw64/x86_64-w64-mingw32/include/string.h:116:28: note: previous definition of 'strncasecmp' was here
  116 |   __CRT_INLINE int __cdecl strncasecmp (const char *__sz1, const char *__sz2, size_t __sizeMaxCompare) { return _strnicmp (__sz1, __sz2, __sizeMaxCompare); }
      |                            ^~~~~~~~~~~
make[2]: *** [Makefile:404: nfc-iclass.o] Error 1

I understand this is probably not something that was tested to compile under Windows, but I would be happy to help test any proposed fixes as needed. I've also compiled this successfully under an Ubuntu VM but for some reason performance with a PN533 seems to be really spotty and tags only detect intermittently.