I am attempting to build CLN (and later, GiNaC) on my Windows XP machine with Mingw. I am using g++ 3.2.3 and the latest binary utilities. I have a build of GMP 4.2.1 for use as a backend for CLN (installed under c:\msys\1.0\local\). CLN was configured with CPPFLAGS=-I/usr/local/include LIBS=/usr/local/lib/libgmp-3.dll CXXFLAGS="-O2 -finline-functions -fomit-frame-pointer -march=i686 -finline-limit=1000" ./configure --with-gmp. The build progressed and after a couple hours the link failed for the shared library. It looks a lot like what was described on ginac-devel when a fellow had problems on Alpha (thread begins here: http://www.ginac.de/lists/ginac-devel/msg00091.html), except that I am using a relatively modern toolchain. The linker errors are of the form: cl_t_c2.lo(.text+0x4e):cl_t_c2.cc: undefined reference to `_GLOBAL__I_cl_module__cl_prin_globals__firstglobalfun' Any thoughts? -Jonathan Brandmeyer P.S. I am using msys to drive the build, but I do not want to use Cygwin.