-CFLAGS += -isystem$(HOME)/stuff/wine_arm/inst/include/wine/msvcrt
-CFLAGS += -isystem$(HOME)/stuff/wine_arm/inst/include/wine/windows
-LDFLAGS += -L$(HOME)/stuff/wine_arm/inst/lib/wine
+WINEROOT ?= $(HOME)/stuff/wine_arm/inst
+CFLAGS += -isystem$(WINEROOT)/include/wine/msvcrt
+CFLAGS += -isystem$(WINEROOT)/include/wine/windows
+LDFLAGS += -L$(WINEROOT)/lib/wine -L$(WINEROOT)/lib
+