Dear sirs: I am a user of Microsoft Fortran, and I am trying to use the GCC Fortran. I am having problems to run the compiler, probably because of linking with libraries. The GCC Fortran was installed in the following structure: c:\MinGW c:\MinGW\bin c:\MinGW\doc c:\MinGW\include c:\MinGW\lib c:\MinGW\mingw c:\MinGW\mingw32 I have Fortran programs in the directory c:\Testes. How can I run the GCC Fortran from the directory c:\Testes ? I try c:\MinGW\bin\gcc -o program program.for but have a lot of errors: C:\Testes>c:\MinGW\bin\gcc -o prog01 prog01.for C:\DOCUME~1\attila\CONFIG~1\Temp/cc0abaaa.o(.text+0x49):prog01.for: undefined re ference to `s_wsfe' C:\DOCUME~1\attila\CONFIG~1\Temp/cc0abaaa.o(.text+0x5f):prog01.for: undefined re ference to `do_fio' C:\DOCUME~1\attila\CONFIG~1\Temp/cc0abaaa.o(.text+0x75):prog01.for: undefined re ference to `do_fio' C:\DOCUME~1\attila\CONFIG~1\Temp/cc0abaaa.o(.text+0x7d):prog01.for: undefined re ference to `e_wsfe' C:\DOCUME~1\attila\CONFIG~1\Temp/cc0abaaa.o(.text+0x9c):prog01.for: undefined re ference to `s_stop' c:/MinGW/bin/../lib/gcc-lib/mingw32/3.2.3 /../../../libmingw32.a(main.o)(.text+0x 97):main.c: undefined reference to `WinMain@16' Can you help me ? Can you indicate a beginners User Manual ? Yours very trully. Attila D. Firpo e-mail: Attila.Firpo@xxxxxxxxxxxxxxxxxxxxxx