1 files changed, 5 insertions, 1 deletions
diff --git a/defines.h b/defines.h
index 5690eff34c..fc3994b67e 100644
--- a/defines.h
+++ b/defines.h
@@ -55,11 +55,15 @@
 #endif
 #define PATH_SEP_CHAR PATH_SEP[0]
 
-#if defined(__human68k__) || defined(__CYGWIN__)
+#if defined(__human68k__)
 #undef HAVE_RANDOM
 #undef HAVE_SETITIMER
 #endif
 
+#if defined(__CYGWIN__) || defined(DJGPP) || defined(__BOW__)
+#undef HAVE_SETITIMER
+#endif
+
 #ifndef RUBY_PLATFORM
 #define RUBY_PLATFORM "unknown-unknown"
 #endif