Index: adm/qmake/OccToolkit.pri
--- adm/qmake/OccToolkit.pri.orig
+++ adm/qmake/OccToolkit.pri
@@ -59,7 +59,7 @@ win32 {
   CSF_TclTkLibs  = -framework Tk
 } else {
   CSF_dl = -ldl
-  CSF_ThreadLibs = -lpthread -lrt
+  CSF_ThreadLibs = -lpthread
   CSF_OpenGlesLibs = -lEGL -lGLESv2
   CSF_TclTkLibs  = -ltk8.6
   HAVE_XLIB {
