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GCC (as of 15.2.1_p20260214) seems to fail, specifically for GNU Hurd (as seen
by the !defined (__linux__) bit), as gcc's __attribute__ expects an argument
there. It seems rather old (and quite undesirable), so for now, we will just
disable the snippet of code.
diff '--color=auto' -ru NetHack-3.6.7/include/tradstdc.h NetHack-3.6.7-fix/include/tradstdc.h
--- NetHack-3.6.7/include/tradstdc.h 2023-02-15 16:52:57.000000000 -0500
+++ NetHack-3.6.7-fix/include/tradstdc.h 2026-03-24 00:48:35.740547092 -0400
@@ -429,7 +429,7 @@
#if __GNUC__ >= 3
#define UNUSED __attribute__((unused))
#define NORETURN __attribute__((noreturn))
-#if !defined(__linux__) || defined(GCC_URWARN)
+#if 0
/* disable gcc's __attribute__((__warn_unused_result__)) since explicitly
discarding the result by casting to (void) is not accepted as a 'use' */
#define __warn_unused_result__ /*empty*/
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