From Bernardt Duvenhage: "I noticed that in 'src/OpenThreads/pthreads/CMakeLists.txt' a '!' has been written instead of 'NOT' within an if statement expression.

IF(!OSG_COMPILE_FRAMEWORKS) ...
vs.
IF(NOT OSG_COMPILE_FRAMEWORKS) ...

This has the effect of always compiling OpenThreads as a framework under OSX. The CMakeLists.txt that I use to be able to compile the non-framework version of OpenThreads is attached. I simply replaced the '!' replaced by a 'NOT' and added a MESSAGE to notify me when the .framework will be compiled."

src/OpenThreads/pthreads/CMakeLists.txt

@@ -128,7 +128,7 @@ INSTALL(
     RUNTIME DESTINATION bin COMPONENT libopenthreads
 )
 
-IF(!OSG_COMPILE_FRAMEWORKS)
+IF(NOT OSG_COMPILE_FRAMEWORKS)
    INSTALL(
        FILES ${OpenThreads_PUBLIC_HEADERS}
        DESTINATION include/OpenThreads
@@ -136,6 +136,7 @@ IF(!OSG_COMPILE_FRAMEWORKS)
 )
 
 ELSE()
+   MESSAGE("Will compile OpenThreads.framework!")
     SET_TARGET_PROPERTIES(${LIB_NAME} PROPERTIES
          FRAMEWORK TRUE
          FRAMEWORK_VERSION ${OPENTHREADS_VERSION}