-GCCSDK_INSTALL_CROSSBIN ?= /home/riscos/cross/bin
-GCCSDK_INSTALL_ENV ?= /home/riscos/env
-CC = $(GCCSDK_INSTALL_CROSSBIN)/gcc
-AR = $(GCCSDK_INSTALL_CROSSBIN)/ar
-CFLAGS += -Driscos -mpoke-function-name -I$(GCCSDK_INSTALL_ENV)/include \
+ GCCSDK_INSTALL_CROSSBIN ?= /home/riscos/cross/bin
+ GCCSDK_INSTALL_ENV ?= /home/riscos/env
+ CC := $(wildcard $(GCCSDK_INSTALL_CROSSBIN)/*gcc)
+ AR := $(wildcard $(GCCSDK_INSTALL_CROSSBIN)/*ar)
+ CFLAGS += -Driscos -mpoke-function-name -I$(GCCSDK_INSTALL_ENV)/include \