The Windows version of Winteracter includes support for all of LF90 v4.x, Elf90 4.0 and LF95 5.x/7.x, in a single licence. LF90 3.50 is no longer supported. If you are still using LF90 3.x or earlier, we recommend an upgrade to a newer compiler. The Linux version requires Lahey Fortran 6.2 (Linux/x86) or 8.0 (Linux/x86_64). Any of the Express, Standard or Pro variants of LF95 are suitable. The Lahey “Fortran” for .NET compiler is not supported for several reasons, primarily because it does not compile standard Fortran.