+ifeq ($(PLATFORM),os2) # native compiling to OS/2
+RANLIB = echo
+PROGNAME = ../$(PROGBASE).exe
+EXTRA_CFLAGS = -Zbin-files -D__ST_MT_ERRNO__ -Zmtd -fomit-frame-pointer
+EXTRA_LDFLAGS = -lsocket
+PLATFORM = unix
+TARGET = x11
+endif
+
+ifeq ($(PLATFORM),unix) # native compiling to Unix (generic)