ref: be9a3b43372bddb3f6d4f8fdf79bcaf3a9ed23c7
dir: /man/environment/
.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).