+1.5.3 (30 July 2009)
+* The parser now understands user-defined functions by default. The identifier
+ names can now contain underscores.
+
+1.5.2 (10 July 2009)
+* Fixed documentation of return_type_info()
+* Fixed cstdio include issue.
+* GiNaC now requires at least version 1.2.2 of cln.
+