Hi, I would like to report a problem about compiling a simple code with gcc (g++) from: /opt/gcc295/bin/gcc Im using the old gcc compiler. stefan@jupiter:~> gcc --version 2.95.3 stefan@jupiter:~> which gcc /opt/gcc295/bin/gcc Lyx-1.3.2 can't compile using gcc-2.95.3 due some problems I think with libstd++ . Have a look: #include #include #ifdef F77_DUMMY_MAIN # ifdef __cplusplus extern "C" # endif int F77_DUMMY_MAIN() { return 1; } #endif int main () { QString s("mangle_failure"); #if (QT_VERSION < 221) break_me_(\\); #endif ; return 0; } This code works fine with gcc-3.3.1 When I set my PATH to /opt/gcc295/bin the compiler will give: stefan@jupiter:~> export PATH=/opt/gcc295/bin:$PATH stefan@jupiter:~> g++ -O -Wno-non-template-friend -ftemplate-depth-30 -I/usr/lib/qt3/include -L/usr/lib/qt3/lib -isystem /usr/X11R6/include test.cc -lSM -lICE -lc -lm -L/usr/X11R6/lib -lX11 -lqt /tmp/ccRoZCNx.o(.text+0x13): In function `main': : undefined reference to `QString::QString(char const *)' /tmp/ccRoZCNx.o(.text+0x23): In function `main': : undefined reference to `QString::shared_null' /tmp/ccRoZCNx.o(.text+0x2e): In function `main': : undefined reference to `QStringData::deleteSelf(void)' /tmp/ccRoZCNx.o(.text+0x4c): In function `main': : undefined reference to `QString::shared_null' /tmp/ccRoZCNx.o(.text+0x57): In function `main': : undefined reference to `QStringData::deleteSelf(void)' collect2: ld returned 1 exit status any idea what can we do. Lyx132 can't compile because ./configure fails exactly to this point. Many thanks Stefan