From Stephan Huber and Mathieu Marache, "attached you'll find framework support for os x via cmake. Please credit

Mathieu Marache, he added the last missing piece to this puzzle.

I think it is safe to commit these changes to trunk, as the traditional
way via dylibs should work as before.

Here's some more info how to get frameworks:

With these modifications it is possible to compile frameworks on OS X,
when you set the Cmake-option OSG_COMPILE_FRAMEWORKS to true. If you
want to embed the frameworks in your app-bundle make sure to set
OSG_COMPILE_FRAMEWORKS_INSTALL_NAME_DIR accordingly.

You'll have to build the install-target of the generated xcode-projects
as this sets the install_name_dirs of the frameworks and plugins."

src/OpenThreads/pthreads/CMakeLists.txt

@@ -127,10 +127,20 @@ INSTALL(
     LIBRARY DESTINATION lib${LIB_POSTFIX} COMPONENT libopenthreads
     RUNTIME DESTINATION bin COMPONENT libopenthreads
 )
-INSTALL(
-    FILES ${OpenThreads_PUBLIC_HEADERS}
-    DESTINATION include/OpenThreads
-    COMPONENT libopenthreads-dev
+
+IF(!OSG_COMPILE_FRAMEWORKS)
+   INSTALL(
+       FILES ${OpenThreads_PUBLIC_HEADERS}
+       DESTINATION include/OpenThreads
+       COMPONENT libopenthreads-dev
 )
 
+ELSE()
+    SET_TARGET_PROPERTIES(${LIB_NAME} PROPERTIES
+         FRAMEWORK TRUE
+         FRAMEWORK_VERSION ${OPENTHREADS_VERSION}
+         PUBLIC_HEADER  "${OpenThreads_PUBLIC_HEADERS}"
+         INSTALL_NAME_DIR "${OSG_COMPILE_FRAMEWORKS_INSTALL_NAME_DIR}"
+    )
+ENDIF()
 #commented out# INCLUDE(ModuleInstall OPTIONAL)