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-rw-r--r--include/math.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/math.h b/include/math.h
index b28c4412e2..ba7bba018a 100644
--- a/include/math.h
+++ b/include/math.h
@@ -6,6 +6,8 @@
 /* Now define the internal interfaces.  */
 extern int __matherr (struct exception *__exc);
 
+extern int __signgam;
+
 # if IS_IN (libc) || IS_IN (libm)
 hidden_proto (__finite)
 hidden_proto (__isinf)