'colly' provides a small set of utilities and an associated C++ library for manipulating molly spectra.
Installation order: subs --> colly
See the README.rst file for cpp-subs on my github pages for some information on installation. That page explains likely problems you might have locating pgplot headers and libraries. The same can happen at this point when you try to locate subs headers and libraries, so look at that page to see what it says about CPPFLAGS and LDFLAGS.
Tom Marsh