diff --git a/config/SCOOS.mk b/config/SCOOS.mk
index d83a30652625..afbeae0fe6f3 100644
--- a/config/SCOOS.mk
+++ b/config/SCOOS.mk
@@ -80,6 +80,12 @@ ifdef NEED_SCO_PM
 PLATFORM_FLAGS		+= -DSCO_PM
 endif
 
+ifeq ($(USE_PTHREADS),1)
+#PORT_FLAGS		+= -D_PR_NEED_FAKE_POLL
+else
+PORT_FLAGS		+= -D_PR_LOCAL_THREADS_ONLY
+endif
+
 BUILD_UNIX_PLUGINS	= 1
 
 MKSHLIB			= $(LD) $(DSO_LDOPTS)