diff --git a/Include/osdefs.h b/Include/osdefs.h
new file mode 100644
index 00000000000..f09b88d211d
--- /dev/null
+++ b/Include/osdefs.h
@@ -0,0 +1,43 @@
+/***********************************************************
+Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
+Netherlands.
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Operating system dependencies */
+
+#ifdef macintosh
+#define SEP ':'
+#define MAXPATHLEN 256
+#endif
+
+#ifdef MSDOS
+#define SEP '\\'
+#define MAXPATHLEN 256
+#endif
+
+#ifndef SEP
+#define SEP '/'
+#endif
+
+#ifndef MAXPATHLEN
+#define MAXPATHLEN 1024
+#endif