Simplify build system

gtk/Makefile

@@ -1,22 +1,26 @@
-CFLAGS = -Wall -O2 -I.. `pkg-config --cflags gtk+-3.0`
-LDFLAGS = `pkg-config --libs gtk+-3.0`
-DSTDIR ?= $(shell find /usr/lib* -type d -path "*/gtk-3.0/*/immodules" 2>/dev/null | head -1)
+PROG = im-strans.so
+CFLAGS = -Wall -O2 -I.. $(shell pkg-config --cflags gtk+-3.0)
+LDFLAGS = $(shell pkg-config --libs gtk+-3.0)
+DSTDIR ?= $(shell find /usr/lib* -type d \
+	-path "*/gtk-3.0/*/immodules" 2>/dev/null | head -1)
 
-im-strans.so: main.c ../ipc.c ../ipc.h
+all: $(PROG)
+
+$(PROG): main.c ../ipc.c ../ipc.h
 	$(CC) -shared -fPIC $(CFLAGS) -o $@ main.c ../ipc.c $(LDFLAGS)
 
-docker: main.c Dockerfile
-	docker build -t strans-gtk .
-	docker run --rm -v $(CURDIR)/..:/src -w /src/gtk strans-gtk make im-strans.so
-
-install:
-	mkdir -p $(DSTDIR)
-	cp im-strans.so $(DSTDIR)/
+install: $(PROG)
+	test -n "$(DSTDIR)"
+	mkdir -p "$(DSTDIR)"
+	cp $(PROG) "$(DSTDIR)/"
 	gtk-query-immodules-3.0 --update-cache
 
 uninstall:
-	rm -f $(DSTDIR)/im-strans.so
+	test -n "$(DSTDIR)"
+	rm -f "$(DSTDIR)/$(PROG)"
 	gtk-query-immodules-3.0 --update-cache
 
 clean:
-	rm -f im-strans.so
+	rm -f $(PROG)
+
+.PHONY: all install uninstall clean