Thanks to Johan Smet, we have a working version of glean for Microsoft Windows, using Visual C++ version 6. We still need documentation to help Windows developers install, build, and run glean.
Porting glean to BeOS and MacOS would also be well worthwhile.
Porting glean to other UNIX variants should be straightforward, but I haven't looked into it.
In all of these cases, most of the work is in the window system code (src/libs/dsurf, src/glean/winsys.cpp, src/glean/dsurf.cpp). Some other things are needed in src/libs/timer and src/glean/environ.cpp. It's always possible that differences in compilers will result in a need for more pervasive changes; some problems of this type did arise during the port to Windows.