fix link error with recent glibc versions

components/CMakeLists.txt

@@ -72,5 +72,11 @@ add_library(components STATIC ${COMPONENT_FILES})
 
 target_link_libraries(components ${Boost_LIBRARIES} ${OGRE_LIBRARIES})
 
+# Fix for not visible pthreads functions for linker with glibc 2.15
+if (UNIX AND NOT APPLE)
+target_link_libraries(components ${CMAKE_THREAD_LIBS_INIT})
+endif()
+
+
 # Make the variable accessible for other subdirectories
 set(COMPONENT_FILES ${COMPONENT_FILES} PARENT_SCOPE)