Ok heres the compile log when I try in hammer.
** Executing...
** Command: Change Directory
** Parameters: C:\Sierra\Half-Life
** Executing...
** Command: Copy File
** Parameters: "C:\Sierra\Half-Life\valve\flow_control.map" "C:\Sierra\Half-Life\valve\maps\flow_control.map"
** Executing...
** Command: C:\Sierra\HALF-L~1\valve\VALVEH~1\tools\qcsg.exe
** Parameters: "C:\Sierra\Half-Life\valve\maps\flow_control"
qcsg.exe v2.8 (Jan 31 2000)
-- qcsg
--entering C:\Sierra\Half-Life\valve\maps\flow_control.map
Entity 190, Brush 1: mixed face contentsEntity 197, Brush 0: mixed face contentsEntity 197, Brush 1: mixed face contentsEntity 198, Brush 0: mixed face contentsEntity 198, Brush 1: mixed face contentsEntity 198, Brush 2: mixed face contentsCreateBrush: 0...1...2...3...4...5...6...Entity 0, Brush 864: A 'Unknown Class' @(0,0,0) has a coplanar plane at (-1512, 632, -360), texture -2OUT_CRT2A
Entity 0, Brush 864: A 'Unknown Class' @(0,0,0)
outside world(+/-4096): (-9000, 616, -4104)-(-1512,632,-360)
Entity 0, Brush 864: A 'Unknown Class' @(0,0,0)
outside world(+/-4096): (-9016, 600, -4148)-(-1495,648,-324)
Entity 0, Brush 864: A 'Unknown Class' @(0,0,0)
outside world(+/-4096): (-9032, 584, -4136)-(-1479,664,-328)
Entity 0, Brush 864: A 'Unknown Class' @(0,0,0)
outside world(+/-4096): (-9016, 600, -4122)-(-1495,648,-342)
7...8...9... (2)
CSGBrush: 0...1...2...3...4...5...6...7...8...9... (5)
Using WAD File: \sierra\half-life\valve\xeno.wad
Using WAD File: \sierra\half-life\valve\decals.wad
Using WAD File: \sierra\half-life\valve\halflife.wad
Using WAD File: \sierra\half-life\valve\liquids.wad
Using WAD File: \sierra\half-life\valve\radcore.wad
Using WAD File: \sierra\half-life\valve\arc_textures.wad
Using WAD File: \sierra\half-life\valve\water.wad
Using WAD File: \sierra\half-life\valve\rain_wad.wad
Using WAD File: \sierra\half-life\valve\jeffmods_textures.wad
Using WAD File: \sierra\half-life\valve\hatextures.wad
Using WAD File: \sierra\half-life\valve\hinduhouse.wad
Using WAD File: \sierra\half-life\valve\doora.wad
added 21 additional animating textures.
8 seconds elapsed
** Executing...
** Command: C:\Sierra\HALF-L~1\valve\VALVEH~1\tools\qbsp2.exe
** Parameters: "C:\Sierra\Half-Life\valve\maps\flow_control"
qbsp2.exe v2.2 (Dec 28 1998)
-- qbsp2
--writing C:\Sierra\Half-Life\valve\maps\flow_control.prt
7 seconds elapsed
** Executing...
** Command: C:\Sierra\HALF-L~1\valve\VALVEH~1\tools\qrad.exe
** Parameters: "C:\Sierra\Half-Life\valve\maps\flow_control"
qrad.exe v 1.5 (Apr 6 2000)
--- Radiosity
--2 threads
[Reading texlights from 'C:\Sierra\HALF-L~1\valve\VALVEH~1\tools\lights.rad']
[111 texlights parsed from 'C:\Sierra\HALF-L~1\valve\VALVEH~1\tools\lights.rad']
No vis information, direct lighting only.
13844 faces
1324976 square feet [190796672.00 square inches]
********** ERROR
**********MAX_PATCHES
** Executing...
** Command: C:\Sierra\HALF-L~1\hl.exe
** Parameters: -console +map "flow_control"
I see a few things that came up that ill try fixing.