It looks like there are several "linker options: that are not listed on the documentation page: https://gcc.gnu.org/onlinedocs/gfortran/Link-Options.html#Link-Options At least the following are not described in that documentation for gfortran: -llibrary -l library Search the library named library when linking. -static On systems that support dynamic linking, this prevents linking with the shared libraries. On other systems, this option has no effect. Those descriptions are from the gcc page. The -llibrary option is used in the pymake (https://github.com/modflowpy/pymake ) for compiling MODFLOW, and the -static option is used by cross-compiling mingw64 gfortran version. An example makefile generated by pymake which uses the -lc in the linker is included by the USGS in MODFLOW-2005 v. 1.12.0, a copy of which is at the following address: https://github.com/mwtoews/MODFLOW-2005/blob/release/make/makefile Anyways, forwarding this on so hopefully the next person isn't as confused as I was. v/r, Miles
