That's odd, as DJGPP has <locale.h> which is supposed to declare
setlocale and define LC_ALL, according to
<http://www.delorie.com/djgpp/doc/libc/libc_705.html>. Could you
explain what goes wrong?
Does the following patch fix the problem? It should isolate the issue
better.
diff --git a/src/dfa.c b/src/dfa.c
index 5e60cd5..92ac1b9 100644
--- a/src/dfa.c
+++ b/src/dfa.c
@@ -34,7 +34,11 @@
#include <locale.h>
#include <stdbool.h>
-/* Gawk doesn't use Gnulib, so don't assume static_assert is present. */
+/* Gawk doesn't use Gnulib, so don't assume that setlocale and
+ static_assert are present. */
+#ifndef LC_ALL
+# define setlocale(category, locale) NULL
+#endif
#ifndef static_assert
# define static_assert(cond, diagnostic) \
extern int (*foo (void)) [!!sizeof (struct { int foo: (cond) ? 8 :
-1; })]
