If you don't have a hard disk or didn't install the library on it, then a program can be compiled and linked with the library with the following command:
lc -Lm+PLPLOT:lib/plplot.lib ProgramName
If you have installed the PLPLOT library on a hard disk in the recommended manner, then use the following command:
lc -Lm+HDDISK:plplot/lib/plplot.lib ProgramName
Notice that the PLPLOT functions expect to be linked with the standard Lattice math library. You may want to create a new library that uses the FFP routines or provides 68881 support.