diff --git a/reactos/lib/cmlib/CMakeLists.txt b/reactos/lib/cmlib/CMakeLists.txt
index 38c1b530a59..707707b28a2 100644
--- a/reactos/lib/cmlib/CMakeLists.txt
+++ b/reactos/lib/cmlib/CMakeLists.txt
@@ -15,6 +15,7 @@ list(APPEND SOURCE
 if(CMAKE_CROSSCOMPILING)
     add_library(cmlib ${SOURCE})
     add_dependencies(cmlib bugcodes)
+    add_pch(cmlib cmlib.h)
 else()
     add_definitions(
         -D__NO_CTYPE_INLINES
diff --git a/reactos/lib/cmlib/cmlib.h b/reactos/lib/cmlib/cmlib.h
index 5fb85060130..5a4abbfeff9 100644
--- a/reactos/lib/cmlib/cmlib.h
+++ b/reactos/lib/cmlib/cmlib.h
@@ -5,8 +5,6 @@
  *            Copyright 2001 - 2005 Eric Kohl
  */
 
-#pragma once
-
 //
 // Debug support switch
 //
diff --git a/reactos/lib/cmlib/cmlib.rbuild b/reactos/lib/cmlib/cmlib.rbuild
index 506eef92334..889ec2f3e4c 100644
--- a/reactos/lib/cmlib/cmlib.rbuild
+++ b/reactos/lib/cmlib/cmlib.rbuild
@@ -12,6 +12,7 @@
 	<file>hiveinit.c</file>
 	<file>hivesum.c</file>
 	<file>hivewrt.c</file>
+	<pch>cmlib.h</pch>
 </module>
 <module name="cmlibhost" type="hoststaticlibrary">
 	<include base="cmlibhost">.</include>
diff --git a/reactos/lib/dnslib/CMakeLists.txt b/reactos/lib/dnslib/CMakeLists.txt
index f726f758e17..eae9061928a 100644
--- a/reactos/lib/dnslib/CMakeLists.txt
+++ b/reactos/lib/dnslib/CMakeLists.txt
@@ -23,4 +23,5 @@ list(APPEND SOURCE
     utf8.c)
 
 add_library(dnslib ${SOURCE})
-add_dependencies(dnslib psdk)
\ No newline at end of file
+add_pch(dnslib inc/precomp.h)
+add_dependencies(dnslib psdk)
diff --git a/reactos/lib/dnslib/dnslib.rbuild b/reactos/lib/dnslib/dnslib.rbuild
index 6186055c04f..c3862364894 100644
--- a/reactos/lib/dnslib/dnslib.rbuild
+++ b/reactos/lib/dnslib/dnslib.rbuild
@@ -19,4 +19,7 @@
 	<file>string.c</file>
 	<file>table.c</file>
 	<file>utf8.c</file>
+	<directory name="inc">
+		<pch>precomp.h</pch>
+	</directory>
 </module>
diff --git a/reactos/lib/drivers/sound/CMakeLists.txt b/reactos/lib/drivers/sound/CMakeLists.txt
index 17bc771d157..3865a53aaf8 100644
--- a/reactos/lib/drivers/sound/CMakeLists.txt
+++ b/reactos/lib/drivers/sound/CMakeLists.txt
@@ -1,5 +1,5 @@
 
-add_subdirectory(legacy)
+#add_subdirectory(legacy)
 add_subdirectory(mmebuddy)
 add_subdirectory(mment4)
 add_subdirectory(mmixer)
diff --git a/reactos/lib/drivers/sound/mmixer/CMakeLists.txt b/reactos/lib/drivers/sound/mmixer/CMakeLists.txt
index 4edfc124e47..213b0800bdd 100644
--- a/reactos/lib/drivers/sound/mmixer/CMakeLists.txt
+++ b/reactos/lib/drivers/sound/mmixer/CMakeLists.txt
@@ -15,5 +15,6 @@ list(APPEND SOURCE
     topology.c)
 
 add_library(mmixer ${SOURCE})
+add_pch(mmixer priv.h)
 add_dependencies(mmixer bugcodes)
 
diff --git a/reactos/lib/drivers/sound/mmixer/mmixer.rbuild b/reactos/lib/drivers/sound/mmixer/mmixer.rbuild
index c2d7fdae645..79b09eefe17 100644
--- a/reactos/lib/drivers/sound/mmixer/mmixer.rbuild
+++ b/reactos/lib/drivers/sound/mmixer/mmixer.rbuild
@@ -10,4 +10,5 @@
 	<file>sup.c</file>
 	<file>wave.c</file>
 	<file>topology.c</file>
+	<pch>priv.h</pch>
 </module>
diff --git a/reactos/lib/drivers/sound/mmixer/priv.h b/reactos/lib/drivers/sound/mmixer/priv.h
index 3746f6d247b..d5446b81b37 100644
--- a/reactos/lib/drivers/sound/mmixer/priv.h
+++ b/reactos/lib/drivers/sound/mmixer/priv.h
@@ -1,5 +1,3 @@
-#pragma once
-
 #include <pseh/pseh2.h>
 #include <ntddk.h>
 
diff --git a/reactos/lib/fslib/vfatlib/CMakeLists.txt b/reactos/lib/fslib/vfatlib/CMakeLists.txt
index 675bbbd16af..8dfeaa58a66 100644
--- a/reactos/lib/fslib/vfatlib/CMakeLists.txt
+++ b/reactos/lib/fslib/vfatlib/CMakeLists.txt
@@ -12,4 +12,5 @@ list(APPEND SOURCE
     fat32.c
     vfatlib.c)
 add_library(vfatlib ${SOURCE})
+add_pch(vfatlib vfatlib.h)
 add_dependencies(vfatlib psdk)
diff --git a/reactos/lib/fslib/vfatlib/vfatlib.rbuild b/reactos/lib/fslib/vfatlib/vfatlib.rbuild
index 1d40958cdf9..037df56faca 100644
--- a/reactos/lib/fslib/vfatlib/vfatlib.rbuild
+++ b/reactos/lib/fslib/vfatlib/vfatlib.rbuild
@@ -6,6 +6,7 @@
 	<file>fat16.c</file>
 	<file>fat32.c</file>
 	<file>vfatlib.c</file>
+	<pch>vfatlib.h</pch>
 
 	<directory name="check">
 		<file>boot.c</file>
diff --git a/reactos/lib/fslib/vfatxlib/CMakeLists.txt b/reactos/lib/fslib/vfatxlib/CMakeLists.txt
index fdc7414fe34..1f4e54439d4 100644
--- a/reactos/lib/fslib/vfatxlib/CMakeLists.txt
+++ b/reactos/lib/fslib/vfatxlib/CMakeLists.txt
@@ -1,6 +1,6 @@
 
 add_library(vfatxlib fatx.c vfatxlib.c)
-
+add_pch(vfatxlib vfatxlib.h)
 target_link_libraries(vfatxlib chkstk)
 
 if(NOT MSVC)
diff --git a/reactos/lib/fslib/vfatxlib/vfatxlib.rbuild b/reactos/lib/fslib/vfatxlib/vfatxlib.rbuild
index bc7736cd6a7..2a41ebcbd73 100644
--- a/reactos/lib/fslib/vfatxlib/vfatxlib.rbuild
+++ b/reactos/lib/fslib/vfatxlib/vfatxlib.rbuild
@@ -4,4 +4,5 @@
 	<include base="vfatxlib">.</include>
 	<file>fatx.c</file>
 	<file>vfatxlib.c</file>
+	<pch>vfatxlib.h</pch>
 </module>
diff --git a/reactos/lib/newinflib/CMakeLists.txt b/reactos/lib/newinflib/CMakeLists.txt
index bc57ae6b649..65b092e11fc 100644
--- a/reactos/lib/newinflib/CMakeLists.txt
+++ b/reactos/lib/newinflib/CMakeLists.txt
@@ -11,6 +11,7 @@ if(CMAKE_CROSSCOMPILING)
         infrosput.c)
 
     add_library(inflib ${GLOBAL_FILES} ${SOURCE})
+    add_pch(inflib inflib.h)
     add_dependencies(inflib psdk)
 else()
     list(APPEND SOURCE
diff --git a/reactos/lib/newinflib/inflib.rbuild b/reactos/lib/newinflib/inflib.rbuild
index d43e7ec424c..c6758ab5559 100644
--- a/reactos/lib/newinflib/inflib.rbuild
+++ b/reactos/lib/newinflib/inflib.rbuild
@@ -9,6 +9,7 @@
 	<file>infrosgen.c</file>
 	<file>infrosget.c</file>
 	<file>infrosput.c</file>
+	<pch>inflib.h</pch>
 </module>
 <module name="newinflibhost" type="hoststaticlibrary" allowwarnings="true">
 	<include base="newinflibhost">.</include>
diff --git a/reactos/lib/smlib/CMakeLists.txt b/reactos/lib/smlib/CMakeLists.txt
index ca5c16de4cd..2bcda9d48c8 100644
--- a/reactos/lib/smlib/CMakeLists.txt
+++ b/reactos/lib/smlib/CMakeLists.txt
@@ -8,4 +8,5 @@ list(APPEND SOURCE
     lookupss.c)
     
 add_library(smlib ${SOURCE})
+add_pch(smlib precomp.h)
 add_dependencies(smlib psdk)