+AC_DEFUN(jm_PREREQ_HASH,
+[
+ AC_CHECK_HEADERS(stdlib.h stdbool.h)
+ AC_REQUIRE([jm_CHECK_DECLS])
+])
+
+# If you use human.c, you need the following files:
+# uintmax_t.m4 inttypes_h.m4 ulonglong.m4
+AC_DEFUN(jm_PREREQ_HUMAN,
+[
+ AC_CHECK_HEADERS(limits.h stdlib.h string.h)
+ AC_CHECK_DECLS([getenv])
+ AC_REQUIRE([jm_AC_HEADER_INTTYPES_H])
+ AC_REQUIRE([jm_AC_TYPE_UINTMAX_T])
+])
+
+AC_DEFUN(jm_PREREQ_MEMCHR,
+[
+ AC_CHECK_HEADERS(limits.h stdlib.h bp-sym.h)
+])
+