Tim, Brian, Thank you! Your explanations clear and thoughtful and I am learning a lot. The documentation I had about dependencies and even cygwin's package-picker did not give me any clues as to which of the dependencies had devel/run split packages and which ones did not. In fact "cygcheck -c" mislead me to believe that I had installed what was required. From CygWin's perspective, it would be useful if they had a GCC-Build package that just selected all the right components. Cheers, Lee