add static-library and install targets to makefile

Makefile

@@ -1,15 +1,24 @@
 CFLAGS := -Wall -g2 -O2
 LDFLAGS := -lncurses
 
-all: runtusl
+all: runtusl libtusl.a
+
+install: tusl.h libtusl.a tuslrc.ts
+	install tusl.h /usr/local/include
+	install libtusl.a /usr/local/lib
+	-mkdir /usr/local/share/tusl
+	install tuslrc.ts /usr/local/share/tusl
 
 runtusl: runtusl.o tusl.o
 runtusl.o: runtusl.c tusl.h 
 
+libtusl.a: tusl.o
+	ar -rs libtusl.a $<
+
 tusl.o: tusl.c tusl.h 
 
 runcurst: runcurst.o tusl.o
 runcurst.o: runcurst.c tusl.h 
 
 clean:
-	rm -f *.o runtusl runcurst
+	rm -f *.o *.a runtusl runcurst