> > Slackware Current 64-bit > > > > The failure: > > > > > /usr/lib64/gcc/x86_64-slackware-linux/4.7.1/../../../../x86_64-slackware-linux/bin/ld: > CMakeFiles/rosegardensequencer.dir/sequencer/main.cpp.o: > > undefined reference to symbol 'pthread_sigmask@@GLIBC_2.2.5' > > > /usr/lib64/gcc/x86_64-slackware-linux/4.7.1/../../../../x86_64-slackware-linux/bin/ld: > note: 'pthread_sigmask@@GLIBC_2.2.5' is defined in DSO > /lib64/libpthread.so.0 so try adding it to the linker command line > > /lib64/libpthread.so.0: could not read symbols: Invalid operation > > collect2: error: ld returned 1 exit status > > > > rosegarden builds without that error in 32-bit. > > > > How to fix? > > Add "pthead" to linker. Thank you. How do I do that? Second, why is that needed for 64-bit and not 32-bit? Darrell