Hi, I'm having trouble building gcc 4.7.0 on 32-bit Ubuntu 12.04. I configure with: ../gcc-4.7.0/configure --enable-languages=c,c++,fortran --prefix=$HOME/apps/gcc-4.7.0 --program-suffix=-4.7 and the compile with "make". After some time, I receive an error indicating that gnu/stub-32.h cannot be found. I do have this file, so I try: make CFLAGS=-I/usr/include/i386-linux-gnu and now receive errors from a similar build stage: checking for C compiler default output file name... configure: error: in `/home/paul/code/gcc-4.7/build/gcc': configure: error: C compiler cannot create executables If I cd into the gcc directory and investigate, it seems like a simple compilation, using the existing gcc 4.6, is failing on a simple task due to the presence of a file called specs. I've tried a few other things, such as unsetting LIBRARY_PATH; and I've also installed g++multilib, but with no luck. Can anyone make a suggestion? Thanks, Paul The University of Glasgow, charity number SC004401