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-rw-r--r--math/bits/cmathcalls.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/math/bits/cmathcalls.h b/math/bits/cmathcalls.h
index d94e764930..ca0dfe1b9c 100644
--- a/math/bits/cmathcalls.h
+++ b/math/bits/cmathcalls.h
@@ -90,6 +90,11 @@ __MATHCALL (cexp, (_Mdouble_complex_ __z));
/* Natural logarithm of Z. */
__MATHCALL (clog, (_Mdouble_complex_ __z));
+#ifdef __USE_GNU
+/* The base 10 logarithm is not defined by the standard but to implement
+ the standard C++ library it is handy. */
+__MATHCALL (clog10, (_Mdouble_complex_ __z));
+#endif
/* Power functions. */