- AC_REQUIRE([AC_HEADER_STDC])
- AC_CHECK_HEADERS_ONCE([fcntl.h inttypes.h stddef.h stdint.h])
- AC_CHECK_HEADERS_ONCE([stdlib.h string.h sys/param.h unistd.h])
-
- # Checks for typedefs, structures, and compiler characteristics.
- AC_REQUIRE([AM_STDBOOL_H])
- AC_REQUIRE([AC_C_CONST])
- AC_REQUIRE([AC_TYPE_SIZE_T])
- AC_REQUIRE([gt_INTTYPES_PRI])
- AC_CHECK_TYPES([ptrdiff_t])