I want to install netgen and try to compile the source code. During this I got the error message:
U -L/usr/lib/x86_64-linux-gnu -ltk8.6 -ltcl8.6 -lGL -lXmu -lX11 -fopenmp -Wl,-rpath -Wl,/opt/netgen/lib
/usr/bin/ld: cannot find -lXmu
collect2: error: ld returned 1 exit status
make[2]: *** [netgen] Error 1
Maybe I have to install an additional package? Does anyone have an idea?