Hello, everyone: After I upgrade gcc from 4.4.7 to 5.2.0 under oracle linux 6.7, the system can't pass config mpich 3.1.4 when I run: ./configure -prefix=/usr/local/share/mpich-3.1.4/ |& tee c.txt below is error message: configure: error: Unable to configure with Fortran support because configure could not determine the size of a Fortran INTEGER. Consider setting CROSS_F77_SIZEOF_INTEGER to the length in bytes of a Fortran INTEGER When I use gcc 4.4.7, there's no error to make mpich 3.1.4. and below is the process how to upgrade gcc: wget ftp://ftp.gnu.org/gnu/gcc/gcc-5.2.0/gcc-5.2.0.tar.bz2 tar -jxvf gcc-5.2.0.tar.bz2 cd gcc-5.2.0 ./contrib/download_prerequisites cd .. mkdir /usr/local/share/gcc-5.2.0 ./gcc-5.2.0/configure --prefix=/usr/local/share/gcc-5.2.0/ --disable-multilib --enable-languages=c,c++,objc,obj-c++,java,fortran make -j4 sudo make install _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss