diff --git a/config/StdGNU.mk b/config/StdGNU.mk
index 039274ea61..490ebdf23c 100644
--- a/config/StdGNU.mk
+++ b/config/StdGNU.mk
@@ -1,27 +1,27 @@
-AS         = $(CROSS_COMPILE)as
-LD         = $(CROSS_COMPILE)ld
+AS        ?= $(CROSS_COMPILE)as
+LD        ?= $(CROSS_COMPILE)ld
 ifeq ($(clang),y)
-CC         = $(CROSS_COMPILE)clang
-CXX        = $(CROSS_COMPILE)clang++
-LD_LTO     = $(CROSS_COMPILE)llvm-ld
+CC        ?= $(CROSS_COMPILE)clang
+CXX       ?= $(CROSS_COMPILE)clang++
+LD_LTO    ?= $(CROSS_COMPILE)llvm-ld
 else
-CC         = $(CROSS_COMPILE)gcc
-CXX        = $(CROSS_COMPILE)g++
-LD_LTO     = $(CROSS_COMPILE)ld
+CC        ?= $(CROSS_COMPILE)gcc
+CXX       ?= $(CROSS_COMPILE)g++
+LD_LTO    ?= $(CROSS_COMPILE)ld
 endif
-CPP        = $(CC) -E
-AR         = $(CROSS_COMPILE)ar
-RANLIB     = $(CROSS_COMPILE)ranlib
-NM         = $(CROSS_COMPILE)nm
-STRIP      = $(CROSS_COMPILE)strip
-OBJCOPY    = $(CROSS_COMPILE)objcopy
-OBJDUMP    = $(CROSS_COMPILE)objdump
-SIZEUTIL   = $(CROSS_COMPILE)size
+CPP       ?= $(CC) -E
+AR        ?= $(CROSS_COMPILE)ar
+RANLIB    ?= $(CROSS_COMPILE)ranlib
+NM        ?= $(CROSS_COMPILE)nm
+STRIP     ?= $(CROSS_COMPILE)strip
+OBJCOPY   ?= $(CROSS_COMPILE)objcopy
+OBJDUMP   ?= $(CROSS_COMPILE)objdump
+SIZEUTIL  ?= $(CROSS_COMPILE)size
 
 # Allow git to be wrappered in the environment
 GIT        ?= git
 
-INSTALL      = install
+INSTALL     ?= install
 INSTALL_DIR  = $(INSTALL) -d -m0755 -p
 INSTALL_DATA = $(INSTALL) -m0644 -p
 INSTALL_PROG = $(INSTALL) -m0755 -p