> > 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