diff --git a/Modules/Platform/Darwin.cmake b/Modules/Platform/Darwin.cmake
index 7ba6c5696..46412697b 100644
--- a/Modules/Platform/Darwin.cmake
+++ b/Modules/Platform/Darwin.cmake
@@ -149,5 +149,4 @@ SET(CMAKE_SYSTEM_APPBUNDLE_PATH
   /Developer/Applications)
 
 INCLUDE(Platform/UnixPaths)
-SET(CMAKE_SYSTEM_INCLUDE_PATH ${CMAKE_SYSTEM_INCLUDE_PATH} /sw/include)
-SET(CMAKE_SYSTEM_LIBRARY_PATH ${CMAKE_SYSTEM_LIBRARY_PATH} /sw/lib)
+LIST(APPEND CMAKE_SYSTEM_PREFIX_PATH /sw)
diff --git a/Modules/Platform/UnixPaths.cmake b/Modules/Platform/UnixPaths.cmake
index 22c9a8623..b7f060d01 100644
--- a/Modules/Platform/UnixPaths.cmake
+++ b/Modules/Platform/UnixPaths.cmake
@@ -5,10 +5,21 @@ SET(UNIX 1)
 GET_FILENAME_COMPONENT(_CMAKE_INSTALL_DIR "${CMAKE_ROOT}" PATH)
 GET_FILENAME_COMPONENT(_CMAKE_INSTALL_DIR "${_CMAKE_INSTALL_DIR}" PATH)
 
-SET(CMAKE_SYSTEM_INCLUDE_PATH ${CMAKE_SYSTEM_INCLUDE_PATH}
+# List common installation prefixes.  These will be used for all
+# search types.
+LIST(APPEND CMAKE_SYSTEM_PREFIX_PATH
   # Standard
-  /include /usr/include /usr/local/include
+  / /usr /usr/local
 
+  # CMake install location
+  "${_CMAKE_INSTALL_DIR}"
+
+  # Project install destination.
+  "${CMAKE_INSTALL_PREFIX}"
+  )
+
+# List common include file locations not under the common prefixes.
+LIST(APPEND CMAKE_SYSTEM_INCLUDE_PATH
   # Windows API on Cygwin
   /usr/include/w32api
 
@@ -19,14 +30,9 @@ SET(CMAKE_SYSTEM_INCLUDE_PATH ${CMAKE_SYSTEM_INCLUDE_PATH}
   /opt/local/include /usr/pkg/include
   /opt/csw/include /opt/include  
   /usr/openwin/include
-  "${_CMAKE_INSTALL_DIR}/include"
-  "${CMAKE_INSTALL_PREFIX}/include"
   )
 
-SET(CMAKE_SYSTEM_LIBRARY_PATH ${CMAKE_SYSTEM_LIBRARY_PATH}
-  # Standard
-  /lib     /usr/lib     /usr/local/lib
-
+LIST(APPEND CMAKE_SYSTEM_LIBRARY_PATH
   # Windows API on Cygwin
   /usr/lib/w32api
 
@@ -37,18 +43,13 @@ SET(CMAKE_SYSTEM_LIBRARY_PATH ${CMAKE_SYSTEM_LIBRARY_PATH}
   /opt/local/lib /usr/pkg/lib
   /opt/csw/lib /opt/lib 
   /usr/openwin/lib
-  "${_CMAKE_INSTALL_DIR}/lib"
-  "${CMAKE_INSTALL_PREFIX}/lib"
   )
 
-SET(CMAKE_SYSTEM_PROGRAM_PATH ${CMAKE_SYSTEM_PROGRAM_PATH}
-  /bin /usr/bin /usr/local/bin /usr/pkg/bin /sbin
-  "${_CMAKE_INSTALL_DIR}/bin"
-  "${CMAKE_INSTALL_PREFIX}/bin"
+LIST(APPEND CMAKE_SYSTEM_PROGRAM_PATH
+  /usr/pkg/bin
   )
 
-SET(CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES
-  ${CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES}
+LIST(APPEND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES
   /lib /usr/lib /usr/lib32 /usr/lib64
   )
 
diff --git a/Modules/Platform/WindowsPaths.cmake b/Modules/Platform/WindowsPaths.cmake
index 11fc630ed..45ed4795d 100644
--- a/Modules/Platform/WindowsPaths.cmake
+++ b/Modules/Platform/WindowsPaths.cmake
@@ -1,17 +1,31 @@
 GET_FILENAME_COMPONENT(_CMAKE_INSTALL_DIR "${CMAKE_ROOT}" PATH)
 GET_FILENAME_COMPONENT(_CMAKE_INSTALL_DIR "${_CMAKE_INSTALL_DIR}" PATH)
 
-# the /bin, /lib and /include dirs are mainly for mingw cross compiler users 
-# under Linux who use CMAKE_FIND_ROOT_PATH
-SET(CMAKE_SYSTEM_INCLUDE_PATH ${CMAKE_SYSTEM_INCLUDE_PATH}  
-    "$ENV{ProgramFiles}" "${CMAKE_INSTALL_PREFIX}/include" "${_CMAKE_INSTALL_DIR}/include" /include)
+# List common installation prefixes.  These will be used for all
+# search types.
+LIST(APPEND CMAKE_SYSTEM_PREFIX_PATH
+  # Standard
+  "$ENV{ProgramFiles}"
+
+  # CMake install location
+  "${_CMAKE_INSTALL_DIR}"
+
+  # Project install destination.
+  "${CMAKE_INSTALL_PREFIX}"
+
+  # MinGW (useful when cross compiling from linux with CMAKE_FIND_ROOT_PATH set)
+  /
+  )
+
+LIST(APPEND CMAKE_SYSTEM_INCLUDE_PATH
+  )
 
 # mingw can also link against dlls which can also be in /bin, so list this too
-SET(CMAKE_SYSTEM_LIBRARY_PATH ${CMAKE_SYSTEM_LIBRARY_PATH} 
-   "$ENV{ProgramFiles}" 
-   "${CMAKE_INSTALL_PREFIX}/lib" "${CMAKE_INSTALL_PREFIX}/bin" 
-   "${_CMAKE_INSTALL_DIR}/lib" "${_CMAKE_INSTALL_DIR}/bin"
-   /lib /bin )
+LIST(APPEND CMAKE_SYSTEM_LIBRARY_PATH
+  "${CMAKE_INSTALL_PREFIX}/bin"
+  "${_CMAKE_INSTALL_DIR}/bin"
+  /bin
+  )
 
-SET(CMAKE_SYSTEM_PROGRAM_PATH ${CMAKE_SYSTEM_PROGRAM_PATH} 
-   "$ENV{ProgramFiles}" "${CMAKE_INSTALL_PREFIX}/bin" "${_CMAKE_INSTALL_DIR}/bin" /bin)
+LIST(APPEND CMAKE_SYSTEM_PROGRAM_PATH
+  )
diff --git a/Modules/Platform/syllable.cmake b/Modules/Platform/syllable.cmake
index 32b619768..2bcaf8cd5 100644
--- a/Modules/Platform/syllable.cmake
+++ b/Modules/Platform/syllable.cmake
@@ -30,7 +30,4 @@ ENDFOREACH(type)
 INCLUDE(Platform/UnixPaths)
 
 # these are Syllable specific:
-SET(CMAKE_SYSTEM_INCLUDE_PATH ${CMAKE_SYSTEM_INCLUDE_PATH} /usr/indexes/include )
-SET(CMAKE_SYSTEM_LIBRARY_PATH ${CMAKE_SYSTEM_LIBRARY_PATH} /usr/indexes/lib )
-SET(CMAKE_SYSTEM_PROGRAM_PATH ${CMAKE_SYSTEM_PROGRAM_PATH} /usr/indexes/bin )
-
+LIST(APPEND CMAKE_SYSTEM_PREFIX_PATH /usr/indexes)