configure was generated by a version of autoconf which is incompatible
with C99 compilers. It cannot be regenerated with current autoconf
versions, so only the generated script is patched.
diff --git a/configure b/configure
index ee6271691bf7d629..96b9f2b4468bbbc1 100755
--- a/configure
+++ b/configure
@@ -3359,6 +3359,7 @@ cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#include <ctype.h>
+#include <stdlib.h>
#if ((' ' & 0x0FF) == 0x020)
# define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))