$ cd ~/archives/gcc/src/gcc-4.0.3 $ ./config.guess i686-pc-cygwin
$ /usr/local/bin/gcc -v Using built-in specs. Target: i686-pc-cygwin Configured with: /home/gob/archives/gcc/src/gcc-4.0.3/configure --enable-languages=c++ --enable-win32-registry Thread model: single gcc version 4.0.3 $ What I wanted was only c++ compiler of version 4.x, so I added --enable-languages option. Though that was my first experience to build gcc with cygwin (with other UNIX systems, I had some experiences), I felt very lucky and was satisfied that I could install without any troubles. Thank you.