--- a/src/auto/configure
+++ b/src/auto/configure
@@ -13922,6 +13922,9 @@ else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+#if STDC_HEADERS
+# include <stdlib.h>
+#endif
 #ifdef HAVE_STDINT_H
 # include <stdint.h>
 #endif
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -4064,6 +4064,9 @@ AC_DEFINE_UNQUOTED(VIM_SIZEOF_LONG, [$ac
 dnl Make sure that uint32_t is really 32 bits unsigned.
 AC_MSG_CHECKING([uint32_t is 32 bits])
 AC_TRY_RUN([
+#if STDC_HEADERS
+# include <stdlib.h>
+#endif
 #ifdef HAVE_STDINT_H
 # include <stdint.h>
 #endif