+Problems with missing standard header files
+-------------------------------------------
+
+Building GiNaC requires many standard header files. If you get a
+configure error complaining about such missing files your compiler and
+library are probably not up to date enough and it's no worth
+continuing. If the only file missing is <sstream>, however, there is
+a solution. GCC-2.95.2 and earlier don't ship with this file. A
+working implementation has been available since GCC-2.95.3. GCC-3.0
+and later have an even better, fully standard-conforming
+implementation, by default. If you are stuck with GCC-2.95.2 or
+earlier and you cannot upgrade your compiler we recommend obtaining
+the libstdc++-v2 <sstream> header written by Magnus Fromreide. It was
+posted to the gcc-patches mailing list on November 21 2000:
+<http://gcc.gnu.org/ml/gcc-patches/2000-11/msg01152.html>.