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-rw-r--r--libs/pbd/pbd/msvc_pbd.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/libs/pbd/pbd/msvc_pbd.h b/libs/pbd/pbd/msvc_pbd.h
index 7529619f1d..5a6b550242 100644
--- a/libs/pbd/pbd/msvc_pbd.h
+++ b/libs/pbd/pbd/msvc_pbd.h
@@ -232,7 +232,15 @@ LIBPBD_API ssize_t PBD_APICALLTYPE pwrite(int handle, const void *buf, size_t
LIBPBD_API int PBD_APICALLTYPE poll(struct pollfd *fds, nfds_t nfds, int timeout);
LIBPBD_API double PBD_APICALLTYPE round(double x);
LIBPBD_API double PBD_APICALLTYPE trunc(double x);
-LIBPBD_API double PBD_APICALLTYPE log2(double x);
+
+#if defined(_MSC_VER) && (_MSC_VER < 1800)
+LIBPBD_API double PBD_APICALLTYPE expm1(double x);
+LIBPBD_API double PBD_APICALLTYPE log1p(double x);
+#endif
+
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+LIBPBD_API double PBD_APICALLTYPE log2 (double x);
+#endif
namespace PBD {