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The use of the WATCOM environment variable and the Watcom Linker "SYSTEM"
directive is recommended over the use of this environment variable.

If you are developing a DOS application, the LIBDOS environment variable
must include the location of the 16-bit Watcom C/C++ DOS library files
(files with the ".lib" filename extension).  This variable is used by the
Watcom Linker (WLINK.EXE).  The default installation directory for the
16-bit Watcom C/C++ DOS libraries is \WATCOM\LIB286\DOS.  The LIBDOS
environment variable must also include the location of the 16-bit Watcom
C/C++ math library files.  The default installation directory for the 16-bit
Watcom C/C++ math libraries is \WATCOM\LIB286.

Example:

     C>set libdos=c:\watcom\lib286\dos;c:\watcom\lib286