I am using Fedora 7 with all of the updates applied. This is an AMD Athelon computer. The following is about the simplest Fortran program possible. program main end I get the following error result: [howard@localhost ProgramTesting]$ gcc -v xsimple.f Using built-in specs. Target: i386-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --enable-plugin --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-1.5.0.0/jre --enable-libgcj-multifile --enable-java-maintainer-mode --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --with-cpu=generic --host=i386-redhat-linux Thread model: posix gcc version 4.1.2 20070925 (Red Hat 4.1.2-27) /usr/libexec/gcc/i386-redhat-linux/4.1.2/f951 xsimple.f -ffixed-form -quiet -dumpbase xsimple.f -mtune=generic -auxbase xsimple -version -I /usr/lib/gcc/i386-redhat-linux/4.1.2/finclude -o /tmp/ccxbGe9M.s GNU F95 version 4.1.2 20070925 (Red Hat 4.1.2-27) (i386-redhat-linux) compiled by GNU C version 4.1.2 20070925 (Red Hat 4.1.2-27). GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 as -V -Qy -o /tmp/ccyJUofp.o /tmp/ccxbGe9M.s GNU assembler version 2.17.50.0.12-4 (i386-redhat-linux) using BFD version 2.17.50.0.12-4 20070128 /usr/libexec/gcc/i386-redhat-linux/4.1.2/collect2 --eh-frame-hdr -m elf_i386 --hash-style=gnu -dynamic-linker /lib/ld-linux.so.2 /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../crt1.o /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../crti.o /usr/lib/gcc/i386-redhat-linux/4.1.2/crtbegin.o -L/usr/lib/gcc/i386-redhat-linux/4.1.2 -L/usr/lib/gcc/i386-redhat-linux/4.1.2 -L/usr/lib/gcc/i386-redhat-linux/4.1.2/../../.. /tmp/ccyJUofp.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/i386-redhat-linux/4.1.2/crtend.o /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../crtn.o /usr/lib/gcc/i386-redhat-linux/4.1.2/../../../crt1.o: In function `_start': (.text+0x18): undefined reference to `main' /tmp/ccyJUofp.o: In function `MAIN__': xsimple.f:(.text+0x1e): undefined reference to `_gfortran_set_std' collect2: ld returned 1 exit status [howard@localhost ProgramTesting]$ The third to the last line has an undefined reference and I don't know how to resolve it. Any help would be appreciated. Howard