From Paul Martz: This is a fix to get the FBX plugin to compile on OS X

src/osgPlugins/fbx/CMakeLists.txt

@@ -28,6 +28,12 @@ IF(WIN32)
     SET(TARGET_EXTERNAL_LIBRARIES wininet)
 ENDIF(WIN32)
 
+IF(APPLE)
+    FIND_LIBRARY(SYS_CONFIG_LIBRARY SystemConfiguration )
+    MARK_AS_ADVANCED(SYS_CONFIG_LIBRARY)
+    SET(TARGET_EXTERNAL_LIBRARIES iconv ${SYS_CONFIG_LIBRARY})
+ENDIF(APPLE)
+
 SET(TARGET_LIBRARIES_VARS FBX_LIBRARY)
 SET(TARGET_ADDED_LIBRARIES osgAnimation)