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.TH chocolate\-doom 6 .SH NAME chocolate\-doom \- historically compatible doom engine .SH SYNOPSIS .B chocolate\-doom [\fIOPTIONS\fR] .SH DESCRIPTION .PP Chocolate Doom is a modern doom engine designed to behave as similar to the original doom game as is possible. .br @content .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). .SH AUTHOR Chocolate Doom is written and maintained by Simon Howard. It is based on the LinuxDoom source code, released by Id Software. .SH COPYRIGHT Copyright \(co id Software Inc. Copyright \(co 2005-8 Simon Howard.