could not build on Windows -> error: expected ‘;’ before ‘extern’

[scottxu007]

$ make
make all-recursive
make[1]: Entering directory '/home/libimobiledevice'
Making all in 3rd_party
make[2]: Entering directory '/home/libimobiledevice/3rd_party'
Making all in ed25519
make[3]: Entering directory '/home/libimobiledevice/3rd_party/ed25519'
CC add_scalar.lo
In file included from /mingw64/include/_cygwin.h:14,
from /mingw64/include/_mingw.h:15,
from /mingw64/include/corecrt.h:10,
from /mingw64/include/crtdefs.h:10,
from /mingw64/include/stddef.h:7,
from ed25519.h:4,
from add_scalar.c:1:
/mingw64/include/stddef.h:18:10: error: expected ‘;’ before ‘extern’
18 | _CRTIMP extern int *__cdecl _errno(void);
| ^~~~~~~
| ;
/mingw64/include/stddef.h:20:3: warning: data definition has no type or storage class
20 | errno_t __cdecl _set_errno(int _Value);
| ^~~~~~~
/mingw64/include/stddef.h:20:3: warning: type defaults to ‘int’ in declaration of ‘errno_t’ [-Wimplicit-int]
/mingw64/include/stddef.h:20:3: warning: ‘cdecl’ attribute only applies to function types [-Wattributes]
/mingw64/include/stddef.h:20:19: error: expected ‘,’ or ‘;’ before ‘_set_errno’
20 | errno_t __cdecl _set_errno(int _Value);
| ^~~~~~~~~~
/mingw64/include/stddef.h:21:3: warning: data definition has no type or storage class
21 | errno_t __cdecl _get_errno(int *_Value);
| ^~~~~~~
/mingw64/include/stddef.h:21:3: warning: type defaults to ‘int’ in declaration of ‘errno_t’ [-Wimplicit-int]
/mingw64/include/stddef.h:21:3: warning: ‘cdecl’ attribute only applies to function types [-Wattributes]
/mingw64/include/stddef.h:21:3: warning: redundant redeclaration of ‘errno_t’ [-Wredundant-decls]
/mingw64/include/stddef.h:20:3: note: previous declaration of ‘errno_t’ with type ‘int’
20 | errno_t __cdecl _set_errno(int _Value);
| ^~~~~~~
/mingw64/include/stddef.h:21:19: error: expected ‘,’ or ‘;’ before ‘_get_errno’
21 | errno_t __cdecl _get_errno(int *_Value);
| ^~~~~~~~~~
/mingw64/include/stddef.h:24:10: error: expected ‘;’ before ‘extern’
24 | _CRTIMP extern unsigned long __cdecl __threadid(void);
| ^~~~~~~
| ;
/mingw64/include/stddef.h:26:10: error: expected ‘;’ before ‘extern’
26 | _CRTIMP extern uintptr_t __cdecl __threadhandle(void);
| ^~~~~~~
| ;
/mingw64/include/stddef.h:26:18: warning: type defaults to ‘int’ in declaration of ‘uintptr_t’ [-Wimplicit-int]
26 | _CRTIMP extern uintptr_t __cdecl __threadhandle(void);
| ^~~~~~~~~
/mingw64/include/stddef.h:26:3: warning: ‘cdecl’ attribute only applies to function types [-Wattributes]
26 | _CRTIMP extern uintptr_t __cdecl __threadhandle(void);
| ^~~~~~~
/mingw64/include/stddef.h:26:36: error: expected ‘,’ or ‘;’ before ‘__threadhandle’
26 | _CRTIMP extern uintptr_t __cdecl __threadhandle(void);
| ^~~~~~~~~~~~~~
In file included from /mingw64/include/crtdefs.h:10,
from /mingw64/include/stddef.h:7,
from ed25519.h:4,
from add_scalar.c:1:
/mingw64/include/corecrt.h:113:13: error: ‘errno_t’ redeclared as different kind of symbol
113 | typedef int errno_t;
| ^~~~~~~
In file included from /mingw64/include/_cygwin.h:14,
from /mingw64/include/_mingw.h:15,
from /mingw64/include/corecrt.h:10,
from /mingw64/include/crtdefs.h:10,
from /mingw64/include/stddef.h:7,
from ed25519.h:4,
from add_scalar.c:1:
/mingw64/include/stddef.h:21:3: note: previous declaration of ‘errno_t’ with type ‘int’
21 | errno_t __cdecl _get_errno(int *_Value);
| ^~~~~~~
make[3]: *** [Makefile:441: add_scalar.lo] Error 1
make[3]: Leaving directory '/home/libimobiledevice/3rd_party/ed25519'
make[2]: *** [Makefile:413: all-recursive] Error 1
make[2]: Leaving directory '/home/libimobiledevice/3rd_party'
make[1]: *** [Makefile:467: all-recursive] Error 1
make[1]: Leaving directory '/home/libimobiledevice'
make: *** [Makefile:397: all] Error 2

Does someone have an idea? Thanks

[mexmer]

what build environment are you using?
it's weird it doesn't have either definition for _CRTIMP or errno_t