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Default value: varies
The opsys variable tells which operating system
version of Epsilon is running, using the following macros defined in
as 1, indicates one of the Windows versions (or else the DOS version)
is running. (See the is-gui variable to distinguish these.)
OS_OS2, defined as 2,
indicates the OS/2 version is running.
OS_UNIX, defined as 3,
indicates Epsilon is running on a platform with UNIX-derived
internals: Mac OS X, Linux, or FreeBSD. (See the is-unix variable
to distinguish these.)
System Primitives (Primitives)
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