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Fix:
conftest.c:28:7: error: implicitly declaring library function 'exit' with type 'void (int) __attribute__((noreturn))' [-Werror,-Wimplicit-function-declaration]
--- configure.orig 2022-01-26 17:59:23.000000000 -0600
+++ configure 2022-01-26 18:00:34.000000000 -0600
@@ -4282,6 +4282,7 @@
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))