https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-util/elfkickers/files
diff -Naur ELFkickers-3.1.orig/ebfc/Makefile ELFkickers-3.1/ebfc/Makefile
--- ELFkickers-3.1.orig/ebfc/Makefile	2014-11-17 14:50:34.000000000 -0500
+++ ELFkickers-3.1/ebfc/Makefile	2016-11-16 17:13:53.297033908 -0500
@@ -1,7 +1,7 @@
 #  Makefile for ebfc
 
-CC = gcc
-CFLAGS = -Wall -Wextra -Wno-missing-field-initializers
+CC ?= gcc
+CFLAGS += -Wno-missing-field-initializers
 
 ebfc: ebfc.o brainfuck.o libelfparts.a
 
diff -Naur ELFkickers-3.1.orig/elfls/Makefile ELFkickers-3.1/elfls/Makefile
--- ELFkickers-3.1.orig/elfls/Makefile	2011-05-31 02:53:05.000000000 -0400
+++ ELFkickers-3.1/elfls/Makefile	2016-11-16 17:12:48.885032137 -0500
@@ -1,7 +1,7 @@
 #  Makefile for elfls
 
-CC = gcc
-CFLAGS = -Wall -Wextra -I../elfrw
+CC ?= gcc
+CFLAGS += -I../elfrw
 
 elfls: elfls.c ../elfrw/libelfrw.a
 
diff -Naur ELFkickers-3.1.orig/elfrw/Makefile ELFkickers-3.1/elfrw/Makefile
--- ELFkickers-3.1.orig/elfrw/Makefile	2011-05-22 14:02:12.000000000 -0400
+++ ELFkickers-3.1/elfrw/Makefile	2016-11-16 17:13:06.653032625 -0500
@@ -1,7 +1,6 @@
 #  Makefile for libelfrw.a
 
-CC = gcc
-CFLAGS = -Wall -Wextra -O3
+CC ?= gcc
 
 LIBOBJS = elfrw.o elfrw_dyn.o elfrw_ehdr.o elfrw_phdr.o elfrw_rel.o \
           elfrw_shdr.o elfrw_sym.o elfrw_ver.o
diff -Naur ELFkickers-3.1.orig/elftoc/Makefile ELFkickers-3.1/elftoc/Makefile
--- ELFkickers-3.1.orig/elftoc/Makefile	2011-05-23 23:30:22.000000000 -0400
+++ ELFkickers-3.1/elftoc/Makefile	2016-11-16 17:12:57.549032375 -0500
@@ -1,8 +1,6 @@
 #  Makefile for elftoc
 
-CC = gcc
-CFLAGS = -Wall -Wextra
-LDFLAGS = -Wall -Wextra
+CC ?= gcc
 
 OBJS = gen.o names.o address.o readelf.o shdrtab.o phdrtab.o dynamic.o \
        pieces.o outbase.o outitems.o outelf64.o outelf32.o out.o elftoc.o
diff -Naur ELFkickers-3.1.orig/infect/Makefile ELFkickers-3.1/infect/Makefile
--- ELFkickers-3.1.orig/infect/Makefile	2011-05-31 02:52:27.000000000 -0400
+++ ELFkickers-3.1/infect/Makefile	2016-11-16 17:12:30.617031634 -0500
@@ -1,7 +1,6 @@
 #  Makefile for infect
 
-CC = gcc
-CFLAGS = -Wall -Wextra
+CC ?= gcc
 
 infect: infect.c
 
diff -Naur ELFkickers-3.1.orig/objres/Makefile ELFkickers-3.1/objres/Makefile
--- ELFkickers-3.1.orig/objres/Makefile	2016-11-14 16:46:24.000000000 -0500
+++ ELFkickers-3.1/objres/Makefile	2016-11-16 17:13:40.225033549 -0500
@@ -1,8 +1,7 @@
 #  Makefile for objres
 
-CC = gcc
-CFLAGS = -Wall -Wextra -I../elfrw
-LDFLAGS = -Wall -Wextra
+CC ?= gcc
+CFLAGS += -I../elfrw
 
 objres: objres.o ../elfrw/libelfrw.a
 
diff -Naur ELFkickers-3.1.orig/rebind/Makefile ELFkickers-3.1/rebind/Makefile
--- ELFkickers-3.1.orig/rebind/Makefile	2011-05-23 23:29:16.000000000 -0400
+++ ELFkickers-3.1/rebind/Makefile	2016-11-16 17:13:17.373032920 -0500
@@ -1,7 +1,7 @@
 #  Makefile for rebind
 
-CC = gcc
-CFLAGS = -Wall -Wextra -I../elfrw
+CC ?= gcc
+CFLAGS += -I../elfrw
 
 rebind: rebind.c ../elfrw/libelfrw.a
 
diff -Naur ELFkickers-3.1.orig/sstrip/Makefile ELFkickers-3.1/sstrip/Makefile
--- ELFkickers-3.1.orig/sstrip/Makefile	2011-05-23 23:29:58.000000000 -0400
+++ ELFkickers-3.1/sstrip/Makefile	2016-11-16 17:14:05.949034256 -0500
@@ -1,7 +1,7 @@
 #  Makefile for sstrip
 
-CC = gcc
-CFLAGS = -Wall -Wextra -I../elfrw
+CC ?= gcc
+CFLAGS += -I../elfrw
 
 sstrip: sstrip.c ../elfrw/libelfrw.a
 
