1 files changed, 5 insertions, 1 deletions
diff --git a/twiddle.c b/twiddle.c
index 2c15617..c3b4764 100644
--- a/twiddle.c
+++ b/twiddle.c
@@ -11,7 +11,11 @@
 #include <assert.h>
 #include <ctype.h>
 #include <limits.h>
-#include <tgmath.h>
+#ifdef NO_TGMATH_H
+#  include <math.h>
+#else
+#  include <tgmath.h>
+#endif
 
 #include "puzzles.h"