diff --git a/code/CMakeModules/FindExternal.cmake b/code/CMakeModules/FindExternal.cmake
index 3ca7774ba..436997d99 100644
--- a/code/CMakeModules/FindExternal.cmake
+++ b/code/CMakeModules/FindExternal.cmake
@@ -7,7 +7,7 @@
 # EXTERNAL_FOUND        - True if the external libraries are available
 
 SET(EXTERNAL_TEMP_PATH ${CMAKE_CURRENT_SOURCE_DIR}/external ${CMAKE_CURRENT_SOURCE_DIR}/../external ${CMAKE_CURRENT_SOURCE_DIR}/3rdParty ${CMAKE_CURRENT_SOURCE_DIR}/../3rdParty ${EXTERNAL_PATH})
-SET(EXTERNAL_TEMP_FILE "include/png.h")
+SET(EXTERNAL_TEMP_FILE "include/zlib.h")
 SET(EXTERNAL_NAME "external")
 
 # If using STLport preprend external_stlport
@@ -17,36 +17,35 @@ IF(WITH_STLPORT)
   SET(EXTERNAL_NAME "external with STLport")
 ENDIF(WITH_STLPORT)
 
-SET(EXTERNAL_FOUND FALSE)
-FOREACH(ITEM ${EXTERNAL_TEMP_PATH})
-  IF(EXISTS "${ITEM}/${EXTERNAL_TEMP_FILE}" AND NOT EXTERNAL_FOUND)
-    SET(EXTERNAL_FOUND TRUE)
-    # Get absolute path to avoid ..
-    GET_FILENAME_COMPONENT(ITEM ${ITEM} ABSOLUTE)
-    SET(EXTERNAL_PATH ${ITEM} CACHE PATH "" FORCE)
-  ENDIF(EXISTS "${ITEM}/${EXTERNAL_TEMP_FILE}" AND NOT EXTERNAL_FOUND)
-ENDFOREACH(ITEM ${EXTERNAL_TEMP_PATH})
+FIND_PATH(EXTERNAL_PATH
+  ${EXTERNAL_TEMP_FILE}
+  PATHS
+  $ENV{EXTERNAL_PATH}
+  ${EXTERNAL_TEMP_PATH}
+  /usr/local
+  /usr
+  /sw
+  /opt/local
+  /opt/csw
+  /opt
+)
 
-IF(EXTERNAL_FOUND)
+IF(EXTERNAL_PATH)
+  SET(EXTERNAL_FOUND TRUE)
   SET(EXTERNAL_INCLUDE_PATH "${EXTERNAL_PATH}/include")
 
-  IF(NOT CMAKE_SIZEOF_VOID_P)
-    INCLUDE (CheckTypeSize)
-    CHECK_TYPE_SIZE("void*"  CMAKE_SIZEOF_VOID_P)
-  ENDIF(NOT CMAKE_SIZEOF_VOID_P)
-
   # Using 32 or 64 bits libraries
-  IF(CMAKE_SIZEOF_VOID_P EQUAL 8)
+  IF(TARGET_X64)
     SET(EXTERNAL_LIBRARY_PATH "${EXTERNAL_PATH}/lib64")
-  ELSE(CMAKE_SIZEOF_VOID_P EQUAL 8)
+  ELSE(TARGET_X64)
     SET(EXTERNAL_LIBRARY_PATH "${EXTERNAL_PATH}/lib")
-  ENDIF(CMAKE_SIZEOF_VOID_P EQUAL 8)
+  ENDIF(TARGET_X64)
 
   SET(CMAKE_INCLUDE_PATH "${EXTERNAL_INCLUDE_PATH};${CMAKE_INCLUDE_PATH}")
   # Stupid hack for FindOpenAL.cmake
   SET(CMAKE_INCLUDE_PATH "${EXTERNAL_PATH};${CMAKE_INCLUDE_PATH}")
   SET(CMAKE_LIBRARY_PATH "${EXTERNAL_LIBRARY_PATH};${CMAKE_LIBRARY_PATH}")
-ENDIF(EXTERNAL_FOUND)
+ENDIF(EXTERNAL_PATH)
 
 IF(EXTERNAL_FOUND)
   IF(NOT External_FIND_QUIETLY)