diff -up ./nss/coreconf/Linux.mk.noforkcheck ./nss/coreconf/Linux.mk
--- ./nss/coreconf/Linux.mk.noforkcheck	2013-11-17 11:26:53.320632775 -0800
+++ ./nss/coreconf/Linux.mk	2013-11-17 11:27:47.135018587 -0800
@@ -199,3 +199,7 @@ PROCESS_MAP_FILE = grep -v ';-' $< | \
 ifeq ($(OS_RELEASE),2.4)
 DEFINES += -DNO_FORK_CHECK
 endif
+
+ifdef NO_FORK_CHECK
+DEFINES += -DNO_FORK_CHECK
+endif