updated makefile

makefile

 SOURCES=main.cpp x.cpp options.cpp
 OBJECTS=$(SOURCES:.cpp=.o)
 EXECUTABLE=slrn
+BINDIR="usr/bin"
 
 all: $(SOURCES) $(EXECUTABLE)
 
 
 clean:
 	rm -rf $(OBJECTS) $(EXECUTABLE)
+
+install: all
+	mkdir -p $(DESTDIR)/$(BINDIR)
+	cp $(CURDIR)/slrn $(DESTDIR)/$(BINDIR)