diff -u -r ../apk-tools-2.10.1/Make.rules ./Make.rules
--- ../apk-tools-2.10.1/Make.rules	2018-09-10 08:04:03.000000000 +0000
+++ ./Make.rules	2018-09-10 21:36:27.914805239 +0000
@@ -64,9 +64,9 @@
 # Utilities and default flags for them.
 
 CROSS_COMPILE	?=
-CC		:= $(CROSS_COMPILE)gcc
-AR		:= $(CROSS_COMPILE)ar
-LD		:= $(CROSS_COMPILE)ld
+CC		?= $(CROSS_COMPILE)gcc
+AR		?= $(CROSS_COMPILE)ar
+LD		?= $(CROSS_COMPILE)ld
 INSTALL		:= install
 INSTALLDIR	:= $(INSTALL) -d