Index: iproute2-5.4.0/Makefile
===================================================================
--- iproute2-5.4.0.orig/Makefile
+++ iproute2-5.4.0/Makefile
@@ -27,7 +27,7 @@ KERNEL_INCLUDE?=/usr/include
 BASH_COMPDIR?=$(DATADIR)/bash-completion/completions
 
 # Path to db_185.h include
-DBM_INCLUDE:=$(DESTDIR)/usr/include
+DBM_INCLUDE?=$(DESTDIR)/usr/include
 
 SHARED_LIBS = y
 
@@ -43,7 +43,7 @@ DEFINES+=-DCONFDIR=\"$(CONFDIR)\" \
 #options for mpls
 ADDLIB+=mpls_ntop.o mpls_pton.o
 
-CC := gcc
+CC ?= gcc
 HOSTCC ?= $(CC)
 DEFINES += -D_GNU_SOURCE
 # Turn on transparent support for LFS
@@ -52,7 +52,7 @@ CCOPTS = -O2 -pipe
 WFLAGS := -Wall -Wstrict-prototypes  -Wmissing-prototypes
 WFLAGS += -Wmissing-declarations -Wold-style-definition -Wformat=2
 
-CFLAGS := $(WFLAGS) $(CCOPTS) -I../include -I../include/uapi $(DEFINES) $(CFLAGS)
+CFLAGS += $(WFLAGS) $(CCOPTS) -I../include -I../include/uapi $(DEFINES)
 YACCFLAGS = -d -t -v
 
 SUBDIRS=lib ip tc bridge misc netem genl tipc devlink rdma man