So it doesn't fail with 3.81.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
# Check for minimal make version (note: this check will break at make 10.x)
MIN_MAKE_VERSION=3.81
-ifeq ($(firstword $(sort $(MAKE_VERSION) $(MIN_MAKE_VERSION))),$(MAKE_VERSION))
+ifneq ($(firstword $(sort $(MAKE_VERSION) $(MIN_MAKE_VERSION))),$(MIN_MAKE_VERSION))
$(error You have make '$(MAKE_VERSION)' installed. GNU make >= $(MIN_MAKE_VERSION) is required)
endif