I'm using cygwin to try to build a cross compiler for powerpc 603. In this case I untar the gcc 4.1.1 in: /cygdrive/c/josesdata/gnu/gcc-4.1.1 I followed steps in your configuration link by creating a directory objdirppc inside the gnu directory, same level as gcc-4.1.1. /cygdrive/c/josesdata/gnu/objdirppc I copy to that directory the Makefile.in file and from that directory I did the following step: /cygdrive/c/josesdata/gnu/gcc-4.1.1/configure --target=powerpc --program-suffix=ppc --enable-threads=vxworks --with-cpu=603 --with-arch=603 That step completed, and then I did a make. make is giving the following error: cd . && autoconf autoconf-2.61: no input file make: *** [configure] Error 1 Any ideas, what my problem is? Thanks, Jose