Index: lib/Makefile
===================================================================
--- lib/Makefile
+++ lib/Makefile
@@ -177,7 +177,7 @@
     # Don't allow unresolved symbols.
     LLVMLibsOptions += -Wl,--no-undefined
     # Link in python
-    LLVMLibsOptions += $(PYTHON_BUILD_FLAGS) -lrt -ledit -lncurses -lpanel
+    LLVMLibsOptions += $(PYTHON_BUILD_FLAGS) -lrt -ledit -lncurses -lpanel -lpthread
     LLVMLibsOptions += -Wl,--soname,lib$(LIBRARYNAME)$(SHLIBEXT)
 endif
 
@@ -189,5 +189,5 @@
     LLVMLibsOptions += -Wl,--allow-shlib-undefined
     # Link in python
     LLVMLibsOptions += $(PYTHON_BUILD_FLAGS) -lrt -L/usr/local/lib -lexecinfo \
-                       -ledit -lncurses -lpanel
+                       -ledit -lncurses -lpanel -lpthread
 endif