To create a version of R that can be compiled under windows (starting in Unix) follow the following instructions: o make distclean in the R directory. o edit R/src/windows/Platform.h to indicate the version number o run configure.win. o copy to the Windows machine the R/src directories: - include - appl - graphics - main - math - regex - windows o copy the R directories: - afm - demos - html - library Then create a project in your favorite compiler/ide (mine's watcom these days) o this pretty much just consists of adding the C code to a project o the file engine.c in regex should NOT be included o you need to add the R/src/include;R/src/windows and R/src/regex directories to the list of places to search for .h files o under Watcom you need to turn on case-sensitive linking (Windows linking switches). o you need to add wincons.rc and wincons.rws to the project and under Watcom you need to add /R/src/include to the includes for the resource linker Simply making the project at this point does the trick for me (most of the time).