Index: adm/genproj.tcl
--- adm/genproj.tcl.orig
+++ adm/genproj.tcl
@@ -1516,7 +1516,7 @@ proc osutils:csfList { theOS theCsfLibsMap theCsfFrmsM
       if { "$theOS" == "qnx" } {
         # CSF_ThreadLibs - pthread API is part of libc on QNX
       } else {
-        set aLibsMap(CSF_ThreadLibs) "pthread rt"
+        set aLibsMap(CSF_ThreadLibs) "pthread"
         if { "$::HAVE_TK" == "true" } {
           set aLibsMap(CSF_TclTkLibs) "tk8.6"
         }
