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-.SH ENVIRONMENT
-This section describes environment variables that control Chocolate Doom's
-behavior.
-.TP
-\fBDOOMWADDIR\fR, \fBDOOMWADPATH\fR
-These environment variables provide paths to search for Doom .WAD files when
-looking for a game IWAD file or a PWAD file specified with the '-file' option.
-\fBDOOMWADDIR\fR specifies a single path in which to look for WAD files,
-while \fBDOOMWWADDIR\fR specifies a colon-separated list of paths to search.
-.TP
-\fBPCSOUND_DRIVER\fR
-When running in PC speaker sound effect mode, this environment variable
-specifies a PC speaker driver to use for sound effect playback. Valid
-options are "Linux" for the Linux console mode driver, "BSD" for the
-NetBSD/OpenBSD PC speaker driver, and "SDL" for SDL-based emulated PC speaker
-playback (using the digital output).
-