Description: Workaround to fix FTBFS on armel
  /usr/bin/ld: CMakeFiles/test_blockwisewatersheds.dir/test_watersheds.cxx.o:
    undefined reference to symbol 'pthread_condattr_setclock@@GLIBC_2.4'
Index: libvigraimpex-1.10.0+git20160211.167be93+dfsg/config/VigraConfigureThreading.cmake
===================================================================
--- libvigraimpex-1.10.0+git20160211.167be93+dfsg.orig/config/VigraConfigureThreading.cmake
+++ libvigraimpex-1.10.0+git20160211.167be93+dfsg/config/VigraConfigureThreading.cmake
@@ -9,7 +9,7 @@ macro(VIGRA_CONFIGURE_THREADING)
     set(THREADING_FOUND 1)
     if(THREADING_IMPLEMENTATION MATCHES "boost")
         include_directories(${Boost_INCLUDE_DIR})
-        set(THREADING_LIBRARIES ${Boost_THREAD_LIBRARY} ${Boost_SYSTEM_LIBRARY} ${Boost_DATE_TIME_LIBRARY} ${Boost_CHRONO_LIBRARY})
+        set(THREADING_LIBRARIES ${Boost_THREAD_LIBRARY} ${Boost_SYSTEM_LIBRARY} ${Boost_DATE_TIME_LIBRARY} ${Boost_CHRONO_LIBRARY} pthread)
     elseif(THREADING_IMPLEMENTATION MATCHES "std")
         # Great, we can use the std library.  Nothing to do here...
     elseif(THREADING_IMPLEMENTATION MATCHES "none")