--- a/src/fileformat/CMakeLists.txt	2016-05-26 11:31:23.000000000 +0200
+++ b/src/fileformat/CMakeLists.txt	2016-07-21 23:19:56.510958771 +0200
@@ -53,13 +53,15 @@
 if( OPENEXR_FOUND )
     include_directories("${OPENEXR_INCLUDE_DIR}")
 
+    find_package (Threads)
+
     add_executable(pfsinexr pfsinexr.cpp "${GETOPT_OBJECT}")
-    target_link_libraries(pfsinexr pfs ${OPENEXR_LIBRARIES})
+    target_link_libraries(pfsinexr pfs ${OPENEXR_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
     install (TARGETS pfsinexr DESTINATION bin)
     install (FILES pfsinexr.1 DESTINATION ${MAN_DIR})
 
     add_executable(pfsoutexr pfsoutexr.cpp "${GETOPT_OBJECT}")
-    target_link_libraries(pfsoutexr pfs ${OPENEXR_LIBRARIES})
+    target_link_libraries(pfsoutexr pfs ${OPENEXR_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
     install (TARGETS pfsoutexr DESTINATION bin)
     install (FILES pfsoutexr.1 DESTINATION ${MAN_DIR})
  endif( OPENEXR_FOUND )