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-rw-r--r--math/s_nan.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/math/s_nan.c b/math/s_nan.c
index 9b2c50558b..97f9d898a0 100644
--- a/math/s_nan.c
+++ b/math/s_nan.c
@@ -25,6 +25,7 @@
 #include <ieee754.h>
 
 
+#undef __nan
 double
 __nan (const char *tagp)
 {