I am helping the group from Brandeis University port the clip application from Linux to the Windows platform. I have been using cygwin and Microsoft Visual C++ as my development environment and compiler. I have gotten GNU Prolog to compile using the above, but put all the executables and libraries in the same directory (which I created) and have the PL_PATH variable pointing to that directory in order to get GNU Prolog to execute. I also have PL_PATH pointing to the parent directory of all the subdirectories created my the compile process that contain executables and libraries (i.e. C:\GNU_Prolog_Src\gprolog-1.2.16\src\TopComp for example), but can only get a text mode GNU Prolog that appears not to be able to access its libraries.
I can compile the smath directory of clip (see clip instructions), but when I execute the 'make clip' command', I get the error 'cannot find the path for GNU Prolog, set the environment variable PL_PATH'.