The optimized math libraries, libm.a and libmmt.a, which are included with the Intel® Fortran Compiler, contain the standard math library functions. To use one of the optimized math libraries, you must place libm.a and libmmt.a, and libmmd.a libraries in one of the directories specified by the LIB environment variable. It is recommended that you place libm.a and libmmt.a, and libmmd.a in the first directory specified in the LD_LIBRARY_PATH variable. The libm.a and libmmt.a, and libmmd.a libraries are always linked with Fortran programs. For example, if you place libm.a in directory /perform/, set the LD_LIBRARY_PATH variable to specify a list of directories, containing all other libraries, separated by semicolons.