--- ilmbase-2.1.0/IlmThread/CMakeLists.txt~	2013-12-12 17:19:43.160000000 +0400
+++ ilmbase-2.1.0/IlmThread/CMakeLists.txt	2013-12-12 17:19:32.428000000 +0400
@@ -21,12 +21,13 @@ ENDIF()
 
 IF(BUILD_SHARED_LIBS)
   ADD_DEFINITIONS(-DILMTHREAD_EXPORTS)
+  ADD_DEFINITIONS ( -pthread )
 ENDIF()
 
 ADD_LIBRARY ( IlmThread ${LIB_TYPE}
   ${ILMTHREAD_LIBRARY_SOURCES}
   )
-TARGET_LINK_LIBRARIES(IlmThread Iex)
+TARGET_LINK_LIBRARIES(IlmThread Iex pthread)
 
 INSTALL ( TARGETS
   IlmThread