Because the SGI compiler has warnings in <iostream>, if you configure cmake with -fullwarn, it will not build correctly. Since, cmake does not use the same flags for building other programs, this is not really an issue. If you really want to build with -fullwarn, then do this: ( setenv CXXFLAGS "-LANG:std -fullwarn -woff 1424 -woff 3201" ; ../CMake/configure ) -Bill