https://community.intel.com/t5/Intel-Fortran-Compiler/library-problem/m-p/756327#M11814 If you want to compile, but not link, a source file containing no main program, use the -c option. Tue, 05 Jul 2011 15:34:18 GMT mecej4 2011-07-05T15:34:18Z https://community.intel.com/t5/Intel-Fortran-Compiler/library-problem/m-p/756326#M11813 milenko@milenkons:~/ircg4$ ifort -O1 -CB -traceback -check all -warn all params.for<BR />/opt/intel/composerxe-2011.1.107/compiler/lib/ia32/for_main.o: In function `main':<BR />/export/users/nbtester/x86linux_nightly/branch-12_0/20101117_010000/libdev/frtl/src/libfor/for_main.c:(.text+0x50): undefined reference to `MAIN__'<BR />What does this mean?<BR />I just wanted to change some parameters in my program?I have not made any changes,so I am confused. Tue, 05 Jul 2011 15:25:46 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/library-problem/m-p/756326#M11813 milenko1976 2011-07-05T15:25:46Z https://community.intel.com/t5/Intel-Fortran-Compiler/library-problem/m-p/756327#M11814 If you want to compile, but not link, a source file containing no main program, use the -c option. Tue, 05 Jul 2011 15:34:18 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/library-problem/m-p/756327#M11814 mecej4 2011-07-05T15:34:18Z https://community.intel.com/t5/Intel-Fortran-Compiler/library-problem/m-p/756328#M11815 Thanks mecej4. Tue, 05 Jul 2011 15:59:19 GMT https://community.intel.com/t5/Intel-Fortran-Compiler/library-problem/m-p/756328#M11815 milenko1976 2011-07-05T15:59:19Z