The develop branch fails to build for me at this moment (within my libc build) due to INT_MAX being referenced but not defined. I notice that limits.h is wrapped in an #ifdef, but it is needed unconditionally for INT_MAX.

#ifdef PRINTF_SUPPORT_MSVC_STYLE_INTEGER_SPECIFIERS
#include <limits.h>
#endif

Not knowing what you're up to on that branch, I just wanted to bring this to your attention rather than blindly try to fix it :).