I am compiling nwchem-6.6. In the last linking step, it stopped with an error message like "//lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from command line". it seems the linkage requires -lz. I think I need to modify LDFLAGS by adding this missing library, could you please point out the easiest way to do it? Or is there any other means? Thanks!