Check for declarations of strtoul and strtoull.

diff --git a/m4/xstrtoumax.m4 b/m4/xstrtoumax.m4
index 1befbdd..2797276 100644 (file)
--- a/m4/xstrtoumax.m4
+++ b/m4/xstrtoumax.m4
@@ -7,6 +7,7 @@ AC_DEFUN(jm_AC_PREREQ_XSTRTOUMAX,
   AC_REQUIRE([jm_AC_TYPE_UINTMAX_T])
   AC_REQUIRE([jm_AC_HEADER_INTTYPES_H])
   AC_REQUIRE([jm_AC_TYPE_UNSIGNED_LONG_LONG])
+  AC_CHECK_DECLS([strtoul, strtoull])
   AC_CHECK_HEADERS(stdlib.h)
 
   AC_CACHE_CHECK([whether <inttypes.h> defines strtoumax as a macro],