-GCC-2.95.2 and earlier don't have support for this header. GiNaC can use
-<strstream> instead, but this may cause some trouble later. GCC-3.0 has a
-completely new implementation of the STL-headers (libstdc++-v3) and there,
-standard-conforming support for <sstream> is present. If you can't upgrade
-your compiler we recommend using the libstdc++-v2 <sstream> header 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>.
+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.