diff --git a/core/Makefile b/core/Makefile
index 25c5b9c9..2d1e598d 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -5,6 +5,7 @@ SMSDK = ..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../hl2sdk
 HL2SDK_OB = ../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../hl2sdk-l4d
 MMSOURCE17 = ../../mmsource-1.7
 
@@ -69,11 +70,22 @@ ifeq "$(ENGINE)" "orangebox"
 	BINARY = sourcemod.2.ep2.so
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	BINARY = sourcemod.2.ep2valve.so
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -81,7 +93,7 @@ ifeq "$(ENGINE)" "left4dead"
 	override ENGSET = true
 endif
 
-CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 
 LINK += $(HL2LIB)/tier1_i486.a $(HL2LIB)/mathlib_i486.a vstdlib_i486.so \
 	tier0_i486.so -static-libgcc
diff --git a/extensions/bintools/Makefile b/extensions/bintools/Makefile
index 4570da62..6a18d1d5 100644
--- a/extensions/bintools/Makefile
+++ b/extensions/bintools/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -52,11 +53,23 @@ ifeq "$(ENGINE)" "orangebox"
 	USEMETA = true
 	CFLAGS += -DHOOKING_ENABLED
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+	USEMETA = true
+	CFLAGS += -DHOOKING_ENABLED
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -73,7 +86,7 @@ ifeq "$(USEMETA)" "true"
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn \
 		-I$(SMSDK)/public/extensions -I$(SMSDK)/public/jit -I$(SMSDK)/public/jit/x86
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5  
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/extensions -I$(SMSDK)/public/jit \
 		-I$(SMSDK)/public/jit/x86 -I$(SMSDK)/public/sourcepawn
diff --git a/extensions/clientprefs/Makefile b/extensions/clientprefs/Makefile
index 4060c5d7..ea660db6 100644
--- a/extensions/clientprefs/Makefile
+++ b/extensions/clientprefs/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -50,11 +51,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -68,7 +79,7 @@ ifeq "$(USEMETA)" "true"
 
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn 
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5 
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn -I$(SMSDK)/public/extensions \
 		-I$(MMSOURCE17)/core/sourcehook
diff --git a/extensions/cstrike/Makefile b/extensions/cstrike/Makefile
index 7f7dde7d..833e6b69 100644
--- a/extensions/cstrike/Makefile
+++ b/extensions/cstrike/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -50,11 +51,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -69,7 +80,7 @@ ifeq "$(USEMETA)" "true"
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/extensions \
 		-I$(SMSDK)/public/sourcepawn
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
 endif
diff --git a/extensions/curl/Makefile b/extensions/curl/Makefile
index 30722929..d029a11b 100644
--- a/extensions/curl/Makefile
+++ b/extensions/curl/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -53,11 +54,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -71,7 +82,7 @@ ifeq "$(USEMETA)" "true"
 
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
 endif
diff --git a/extensions/geoip/Makefile b/extensions/geoip/Makefile
index 70b84980..b3fbcbae 100644
--- a/extensions/geoip/Makefile
+++ b/extensions/geoip/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -50,11 +51,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -68,7 +79,7 @@ ifeq "$(USEMETA)" "true"
 
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5 
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
 endif
diff --git a/extensions/mysql/Makefile b/extensions/mysql/Makefile
index b8d3020c..50e236e1 100644
--- a/extensions/mysql/Makefile
+++ b/extensions/mysql/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 MYSQL = ../../../mysql-5.0
@@ -54,11 +55,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -75,7 +86,7 @@ ifeq "$(USEMETA)" "true"
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn -I$(MMSOURCE17)/core/sourcehook \
 		-I$(MYSQL)/include
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5 
 endif
 
 LINK += $(MYSQL)/lib/libmysqlclient_r.a -lz -lpthread
diff --git a/extensions/regex/Makefile b/extensions/regex/Makefile
index ea10b490..49dcb07e 100644
--- a/extensions/regex/Makefile
+++ b/extensions/regex/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -50,11 +51,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -68,7 +79,7 @@ ifeq "$(USEMETA)" "true"
 
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn -I$(MMSOURCE17)/core/sourcehook
 endif
diff --git a/extensions/sdktools/Makefile b/extensions/sdktools/Makefile
index 1d0e063f..8be0f8fa 100644
--- a/extensions/sdktools/Makefile
+++ b/extensions/sdktools/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -53,11 +54,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server -I$(HL2SDK)/common -I$(HL2SDK)/game/shared
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server -I$(HL2SDK)/common -I$(HL2SDK)/game/shared
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -72,7 +83,7 @@ ifeq "$(USEMETA)" "true"
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/mathlib -I$(HL2PUB)/tier0 \
 		-I$(HL2PUB)/tier1 -I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/extensions \
 		-I$(SMSDK)/public/sourcepawn
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
 endif
diff --git a/extensions/sqlite/Makefile b/extensions/sqlite/Makefile
index aaff1037..adf0d4e9 100644
--- a/extensions/sqlite/Makefile
+++ b/extensions/sqlite/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -70,11 +71,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -88,7 +99,7 @@ ifeq "$(USEMETA)" "true"
 
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn -I$(MMSOURCE17)/core/sourcehook
 endif
diff --git a/extensions/structs/Makefile b/extensions/structs/Makefile
index 1fa3e042..a2cb0c9f 100644
--- a/extensions/structs/Makefile
+++ b/extensions/structs/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -50,11 +51,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server -I$(HL2SDK)/game/shared
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -68,7 +79,7 @@ ifeq "$(USEMETA)" "true"
 
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/mathlib -I$(HL2PUB)/tier0 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(METAMOD)/sourcemm -I$(SMSDK)/public
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
 endif
diff --git a/extensions/tf2/Makefile b/extensions/tf2/Makefile
index e90107da..201eb50c 100644
--- a/extensions/tf2/Makefile
+++ b/extensions/tf2/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -51,11 +52,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -70,7 +81,7 @@ ifeq "$(USEMETA)" "true"
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/extensions \
 		-I$(SMSDK)/public/sourcepawn
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
 endif
diff --git a/extensions/topmenus/Makefile b/extensions/topmenus/Makefile
index 5a026f7a..acb48ab8 100644
--- a/extensions/topmenus/Makefile
+++ b/extensions/topmenus/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -51,11 +52,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -69,7 +80,7 @@ ifeq "$(USEMETA)" "true"
 
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn -I$(SMSDK)/public/extensions \
 		-I$(MMSOURCE17)/core/sourcehook
diff --git a/extensions/updater/Makefile b/extensions/updater/Makefile
index b3fcffcb..c72686d4 100644
--- a/extensions/updater/Makefile
+++ b/extensions/updater/Makefile
@@ -5,6 +5,7 @@ SMSDK = ../..
 SRCDS_BASE = ~/srcds
 HL2SDK_ORIG = ../../../hl2sdk
 HL2SDK_OB = ../../../hl2sdk-ob
+HL2SDK_OB_VALVE = ../../../hl2sdk-ob-valve
 HL2SDK_L4D = ../../../hl2sdk-l4d
 MMSOURCE17 = ../../../mmsource-1.7
 
@@ -55,11 +56,21 @@ ifeq "$(ENGINE)" "orangebox"
 	SRCDS = $(SRCDS_BASE)/orangebox
 	override ENGSET = true
 endif
+ifeq "$(ENGINE)" "orangeboxvalve"
+	HL2SDK = $(HL2SDK_OB_VALVE)
+	HL2PUB = $(HL2SDK)/public
+	HL2LIB = $(HL2SDK)/lib/linux
+	CFLAGS += -DSOURCE_ENGINE=4
+	METAMOD = $(MMSOURCE17)/core
+	INCLUDE += -I$(HL2SDK)/public/game/server
+	SRCDS = $(SRCDS_BASE)/orangebox
+	override ENGSET = true
+endif
 ifeq "$(ENGINE)" "left4dead"
 	HL2SDK = $(HL2SDK_L4D)
 	HL2PUB = $(HL2SDK)/public
 	HL2LIB = $(HL2SDK)/lib/linux
-	CFLAGS += -DSOURCE_ENGINE=4
+	CFLAGS += -DSOURCE_ENGINE=5
 	METAMOD = $(MMSOURCE17)/core
 	INCLUDE += -I$(HL2SDK)/public/game/server
 	SRCDS = $(SRCDS_BASE)/l4d
@@ -73,7 +84,7 @@ ifeq "$(USEMETA)" "true"
 
 	INCLUDE += -I. -I.. -Isdk -I$(HL2PUB) -I$(HL2PUB)/engine -I$(HL2PUB)/tier0 -I$(HL2PUB)/tier1 \
 		-I$(METAMOD) -I$(METAMOD)/sourcehook -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn 
-	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+	CFLAGS += -DSE_EPISODEONE=1 -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_ORANGEBOXVALVE=4 -DSE_LEFT4DEAD=5 
 else
 	INCLUDE += -I. -I.. -Isdk -I$(SMSDK)/public -I$(SMSDK)/public/sourcepawn \
 		-I$(SMSDK)/public/extensions -I$(MMSOURCE17)/core/sourcehook