I've applied your patches and created the master.msvc.support branch.

Hello Alexei, thanks for the effort. 1. I used the download button on the web page you sent and got a .tar.gz. It didn't have a configure executable, so I was a bit at a loss on how to start 2. autoreconf complained about missing files in config/, so I copied these from ginac-1.5.8 3. After that, libtool gave a version mismatch so I copied aclocal.m4 and m4/* from ginac-1.5.8 4. The attached patch seems to somehow have slipped through the cracks Problem: MSVC chokes on the "struct" Solution: Removed it 5. After this, compilation went fine. There are still issues with the build environment (getting the right libraries for linking), but I am not motivated right now to fix those. I guess they have nothing to do with GiNaC, anyway. 6. make check compiles, but several of the executables crash. For example, in exam_matrices.cpp, in exam_evalm(), doing the matrix multiplication S*S crashes the program 7. I looked through a diff of ginac-1.5.8 and the new branch, but couldn't find anything obvious yet. Still looking. Best regards, Jan