place main.c under etc/

Makefile

@@ -1,15 +1,19 @@
 CC=gcc
 
-all: build run
+all: build-lib build-main run
 
-build:
+build-main:
+	$(CC) -Wall -o bin/picrin -I./include -L./lib -lpicrin -lreadline etc/main.c
+
+build-lib:
 	cd src; \
 	yacc -d parse.y; \
 	lex scan.l
-	 $(CC) -Wall -o bin/picrin -I./include -lreadline src/main.c src/state.c src/gc.c src/pair.c src/port.c src/symbol.c src/value.c src/y.tab.c src/lex.yy.c src/bool.c src/vm.c src/init.c src/number.c src/time.c src/codegen.c src/error.c
+	 $(CC) -Wall -shared -o lib/libpicrin.so -I./include -lreadline src/state.c src/gc.c src/pair.c src/port.c src/symbol.c src/value.c src/y.tab.c src/lex.yy.c src/bool.c src/vm.c src/init.c src/number.c src/time.c src/codegen.c src/error.c
 
 clean:
 	rm -f src/y.tab.c src/y.tab.h src/lex.yy.c
+	rm -f lib/libpicrin.so
 	rm -f bin/picrin
 
 run: