Sorry if I posted this twice. I wonder if anyone can suggest me how to fix this error which I find during numpy build: ......... creating build/temp.linux-i686-2.6/numpy/linalg compile options: '-DNO_ATLAS_INFO=1 -Inumpy/core/include -Ibuild/src.linux-i686-2.6/numpy/core/include/numpy -Inumpy/core/src -Inumpy/core/include -I/home/gaprea/usr/local/include/python2.6 -c' gcc: numpy/linalg/lapack_litemodule.c gcc: numpy/linalg/python_xerbla.c /usr/bin/gfortran -Wall -L/home/gaprea/usr/local/lib build/temp.linux-i686-2.6/numpy/linalg/lapack_litemodule.o build/temp.linux-i686-2.6/numpy/linalg/python_xerbla.o -L/home/gaprea/usr/local/lib -L/usr/lib -L/home/gaprea/usr/local/lib -Lbuild/temp.linux-i686-2.6 -llapack -lblas -lpython2.6 -lgfortran -o build/lib.linux-i686-2.6/numpy/linalg/lapack_lite.so /usr/lib/gcc/i486-linux-gnu/4.2.4/libgfortranbegin.a(fmain.o): In function `main': (.text+0x23): undefined reference to `MAIN__' collect2: ld returned 1 exit status /usr/lib/gcc/i486-linux-gnu/4.2.4/libgfortranbegin.a(fmain.o): In function `main': (.text+0x23): undefined reference to `MAIN__' collect2: ld returned 1 exit status error: Command "/usr/bin/gfortran -Wall -L/home/gaprea/usr/local/lib build/temp.linux-i686-2.6/numpy/linalg/lapack_litemodule.o build/temp.linux-i686-2.6/numpy/linalg/python_xerbla.o -L/home/gaprea/usr/local/lib -L/usr/lib -L/home/gaprea/usr/local/lib -Lbuild/temp.linux-i686-2.6 -llapack -lblas -lpython2.6 -lgfortran -o build/lib.linux-i686-2.6/numpy/linalg/lapack_lite.so" failed with exit status 1 It seems that the installation program is using gfortran to link while it should have used gcc. I am using Kubuntu 8.04 and I have the following version of gfortran and gcc: $ gfortran -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu4) $ gcc -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu4) does anybody have a suggestion? thanks giuseppe