--- /dev/null
+From 1ba8516045bc8a13fd72e1a85206a04b29d96758 Mon Sep 17 00:00:00 2001
+From: Giulio Benetti <giulio.benetti@benettiengineering.com>
+Date: Thu, 12 Dec 2019 12:57:29 +0100
+Subject: [PATCH] Bug 1603398 - Fix nsinstall.c build failure on RHEL 7
+
+In Linux.mk -DLINUX and -Dlinux must be passed to DEFINES, not
+OS_CFLAGS.
+
+Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
+---
+ nss/coreconf/Linux.mk | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/nss/coreconf/Linux.mk b/nss/coreconf/Linux.mk
+index d07f8a3c5..4b45a6054 100644
+--- a/nss/coreconf/Linux.mk
++++ b/nss/coreconf/Linux.mk
+@@ -132,7 +132,7 @@ endif
+
+ OS_CFLAGS = $(DSO_CFLAGS) $(OS_REL_CFLAGS) $(ARCHFLAG) -pipe -ffunction-sections -fdata-sections -DHAVE_STRERROR
+ ifeq ($(KERNEL),Linux)
+- OS_CFLAGS += -DLINUX -Dlinux
++ DEFINES += -DLINUX -Dlinux
+ endif
+ OS_LIBS = $(OS_PTHREAD) -ldl -lc
+
+--
+2.20.1
+