Red Hat Enterprise Linux AS release 4 (Nahant Update 2)
ships with gcc 3.4.4. xstow won't compile with such a gcc:

 In file included from arg.h:13,
                 from arg.cpp:1:
 range.h: In constructor `EnumRange<EClass>::EnumRange(typename EClass::ETYPE)':
 range.h:25: error: `FIRST__' was not declared in this scope
 range.h:25: error: `LAST__' was not declared in this scope
 range.h: In member function `EnumRange<EClass>& EnumRange<EClass>::operator=(typename EClass::ETYPE)':

.  However, it _does_ build with gcc 4.0.3, and it _does_ build with gcc 3.2.3.
If you'd like to have an xstow RPM for EL AS 4, just use the one for EL AS 3.6.
You'll have to install the compat-libstdc++-33-3.2.3 RPM for that.

                                                       --JvB