mod_options.txt

BARNACLE_FIX_VISIBILITY=OFF # Barnacle tongue length fix
CLIENT_WEAPONS=ON # Client local weapons prediction
CROWBAR_IDLE_ANIM=OFF # Crowbar idle animation
CROWBAR_DELAY_FIX=OFF # Crowbar attack delay fix
CROWBAR_FIX_RAPID_CROWBAR=ON # Rapid crowbar fix
GAUSS_OVERCHARGE_FIX=OFF # Gauss overcharge fix
TRIPMINE_BEAM_DUPLICATION_FIX=OFF # Fix of tripmine beam duplication on level transition
HANDGRENADE_DEPLOY_FIX=OFF # Handgrenade deploy animation fix after finishing a throw
WEAPONS_ANIMATION_TIMES_FIX=OFF # Animation times fix for some weapons
SATCHEL_OLD_BEHAVIOUR=OFF # Old pre-HL 25th satchel's behaviour
OEM_BUILD=OFF # OEM Build
HLDEMO_BUILD=OFF # Demo Build

GAMEDIR=valve # Gamedir path
SERVER_INSTALL_DIR=dlls # Where put server dll
CLIENT_INSTALL_DIR=cl_dlls # Where put client dll 
SERVER_LIBRARY_NAME=hl # Library name for PC platforms