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-rw-r--r--unix/tclConfig.h.in3
1 files changed, 3 insertions, 0 deletions
diff --git a/unix/tclConfig.h.in b/unix/tclConfig.h.in
index 986c721..179f68a 100644
--- a/unix/tclConfig.h.in
+++ b/unix/tclConfig.h.in
@@ -289,6 +289,9 @@
/* Do we have getwd() */
#undef NO_GETWD
+/* Do we have a usable 'isnan'? */
+#undef NO_ISNAN
+
/* Do we have <limits.h>? */
#undef NO_LIMITS_H