seeing as the sourceforge page has it as last updated in " 2008-09-01"
http://sourceforge.net/projects/tuxaqfh/files/
i do believe that this is the gcc4.5 VS gcc 4.0 or gcc3.4
the configure file has gcc2 checks
the configure file was mane with autoconf 2.13 Arch is using 2.66
and automake 1.4 Arch uses 1.11.1
see
http://sourceforge.net/projects/tuxaqfh/develop
i think you need to port it to gcc 4.5 OR install gcc 3.4 alongside 4.5
the gcc 4.3 porting guide and the gcc 4.4 ,4.5
http://gcc.gnu.org/gcc-4.3/porting_to.html
http://gcc.gnu.org/gcc-4.4/porting_to.html
http://gcc.gnu.org/gcc-4.5/
-- edit ---
a guess ( i have not tried it)
add
to gui.cxx