Hi All, I am trying to install gmp-4.2.2 on Ubuntu 7.10 with gcc 4.1.3 installed. But it failed at ./configure stage. I googled and found that this is a common problem. Anybody knows why? I'm pretty sure that gcc is correctly installed. The following is the output during config: pighogswine@pighogswine-desktop:~/gmp-4.2.2$ ./configure checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for gawk... no checking for mawk... mawk checking whether make sets $(MAKE)... yes checking whether to enable maintainer-specific portions of Makefiles... no checking ABI=64 checking compiler gcc -O2 -m64 ... no checking ABI=32 checking compiler gcc -m32 -O2 -fomit-frame-pointer ... no checking compiler gcc -O2 -fomit-frame-pointer ... no checking compiler icc -no-gcc ... no checking whether cc is gcc... yes checking compiler cc -m32 -O2 -fomit-frame-pointer ... no checking compiler cc -O2 -fomit-frame-pointer ... no configure: error: could not find a working compiler, see config.log for details -- Best wishes