Build annotator to bin directory

Makefile

@@ -3,30 +3,30 @@ default: all
 
 all: build
 
-build: builddir build/annotator
+build: builddir build/bin/annotator
 
-GHCFLAGS = -iapp -isrc -Wall -outputdir build
+GHCFLAGS = -iapp -isrc -Wall -O2 -outputdir build/.obj
 DESTDIR = ~/.local
 BINDIR = ${DESTDIR}/bin
 
 builddir:
-	mkdir -p build
+	mkdir -p build/bin build/.obj
 
-build/annotator: app/Main.hs src/*.hs
+build/bin/annotator: app/Main.hs src/*.hs
 	ghc --make $(GHCFLAGS) $< -o $@
 
 watch:
 	@git ls-files src app Makefile | entr make -s build install
 
 clean:
+	@rm -rf build
 	@find . -name "*.hi" -delete
 	@find . -name "*.fix" -delete
 
 distclean: clean
-	@rm -rf build
 	@rm -rf dist
 
-install: build/annotator
+install: build/bin/annotator
 	@install -D -t ${BINDIR} $<
 
 release: script/make-release