[xeeZ]

If you look into amx.h you'll find this code:

Code:

#if defined HAVE_STDINT_H
  #include <stdint.h>
#else
  #if defined __LCC__ || defined __DMC__ || defined LINUX
    #if defined HAVE_INTTYPES_H
      #include <inttypes.h>
    #else
      #include <stdint.h>
    #endif
  #elif !defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L
    /* The ISO C99 defines the int16_t and int_32t types. If the compiler got
     * here, these types are probably undefined.
     */
    #if defined __MACH__
      #include <ppc/types.h>
      typedef unsigned short int  uint16_t;
      typedef unsigned long int   uint32_t;
    #elif defined __FreeBSD__
      #include <inttypes.h>
    #else
      typedef short int           int16_t;
      typedef unsigned short int  uint16_t;
      #if defined SN_TARGET_PS2
        typedef int               int32_t;
        typedef unsigned int      uint32_t;
      #else
        typedef long int          int32_t;
        typedef unsigned long int uint32_t;
      #endif
      #if defined __WIN32__ || defined _WIN32 || defined WIN32
        typedef __int64	          int64_t;
        typedef unsigned __int64  uint64_t;
        #define HAVE_I64
      #elif defined __GNUC__
        typedef long long         int64_t;
        typedef unsigned long long uint64_t;
        #define HAVE_I64
      #endif
    #endif
  #endif
  #define HAVE_STDINT_H
#endif

which basically checks if your platform/compiler has fixed-size integer types ([u]intX_t).

Since you're using Visual Studio it thinks you don't have those, however, Visual C++ since VS 2010 provides stdint.h (probably because they started implementing C++11 in that version), so you can simply define HAVE_STDINT_H and the errors will go away.