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-rw-r--r--src/floatfns.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/floatfns.c b/src/floatfns.c
index 7d741ff1443..999d0a86399 100644
--- a/src/floatfns.c
+++ b/src/floatfns.c
@@ -65,7 +65,7 @@ extern double logb ();
# endif
#endif
-#ifndef NO_MATHERR
+#ifdef NO_MATHERR
#undef HAVE_MATHERR
#endif