diff --git a/Makefile b/Makefile
index 5d06439..914b72d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,42 +1,72 @@
-# Requires GNU make 3.80 or later
+# Works best with GNU make 3.80 or later
 
-VERSION := git-20171006
+VERSION = git-20171012
+
+srcdir = .
+
+PREFIX = /usr/local
+MANPREFIX = $(PREFIX)/share/man
+
+CC ?= gcc
+CFLAGS += -std=c99 -Wall -pedantic
+CPPFLAGS += -I/usr/include/freetype2 -D_XOPEN_SOURCE=700
+DEPFLAGS = -MMD -MP
+LDFLAGS += 
+
+# autoreload backend: inotify/nop
+AUTORELOAD = inotify
+
+# enable features requiring giflib (-lgif)
+HAVE_GIFLIB = 1
+
+# enable features requiring libexif (-lexif)
+HAVE_LIBEXIF = 1
+
+REQ_CPPFLAGS = -I. -DVERSION=\"$(VERSION)\" \
+  -DHAVE_GIFLIB=$(HAVE_GIFLIB) -DHAVE_LIBEXIF=$(HAVE_LIBEXIF)
+ALL_CPPFLAGS = $(REQ_CPPFLAGS) $(CPPFLAGS)
+
+LIB_EXIF_0 =
+LIB_EXIF_1 = -lexif
+LIB_GIF_0 =
+LIB_GIF_1 = -lgif
+LDLIBS = -lImlib2 -lX11 -lXft \
+  $(LIB_EXIF_$(HAVE_LIBEXIF)) $(LIB_GIF_$(HAVE_GIFLIB))
+
+-include config.mk
+
+SRCS = autoreload_$(AUTORELOAD).c commands.c image.c main.c options.c \
+  thumbs.c util.c window.c
+OBJS = $(SRCS:.c=.o)
+DEPS = $(SRCS:.c=.d)
 
 all: sxiv
 
-include config.mk
+.PHONY: all clean install uninstall
+.SUFFIXES:
+.SUFFIXES: .c .o
+$(V).SILENT:
 
-override CPPFLAGS += -I. -DVERSION=\"$(VERSION)\" -DHAVE_GIFLIB=$(HAVE_GIFLIB) -DHAVE_LIBEXIF=$(HAVE_LIBEXIF)
-
-LDLIBS := -lImlib2 -lX11 -lXft
-
-ifneq ($(HAVE_GIFLIB),0)
-	LDLIBS += -lgif
-endif
-ifneq ($(HAVE_LIBEXIF),0)
-	LDLIBS += -lexif
-endif
-
-SRC := autoreload_$(AUTORELOAD).c commands.c image.c main.c options.c thumbs.c util.c window.c
-DEP := $(SRC:.c=.d)
-OBJ := $(SRC:.c=.o)
-
-$(OBJ): config.h Makefile
-
-%.o: %.c
-	@echo "CC $@"
-	$(CC) $(CFLAGS) $(CPPFLAGS) $(DEPFLAGS) -c -o $@ $<
-
-config.h: | config.def.h
-	@echo "GEN $@"
-	cp $| $@
-
-sxiv:	$(OBJ)
+sxiv:	$(OBJS)
 	@echo "LINK $@"
-	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
+
+$(OBJS): config.h $(srcdir)/Makefile
+
+.c.o:
+	@echo "CC $@"
+	$(CC) $(ALL_CPPFLAGS) $(DEPFLAGS) $(CFLAGS) -c -o $@ $<
+
+%.o: $(srcdir)/%.c
+	@echo "CC $@"
+	$(CC) $(ALL_CPPFLAGS) $(DEPFLAGS) $(CFLAGS) -c -o $@ $(srcdir)/$(@:.o=.c)
+
+config.h:
+	@echo "GEN $@"
+	cp $(srcdir)/config.def.h $@
 
 clean:
-	rm -f $(OBJ) $(DEP) sxiv
+	rm -f $(OBJS) $(DEPS) sxiv
 
 install: all
 	@echo "INSTALL bin/sxiv"
@@ -45,7 +75,8 @@ install: all
 	chmod 755 $(DESTDIR)$(PREFIX)/bin/sxiv
 	@echo "INSTALL sxiv.1"
 	mkdir -p $(DESTDIR)$(MANPREFIX)/man1
-	sed "s!PREFIX!$(PREFIX)!g; s!VERSION!$(VERSION)!g" sxiv.1 > $(DESTDIR)$(MANPREFIX)/man1/sxiv.1
+	sed "s!PREFIX!$(PREFIX)!g; s!VERSION!$(VERSION)!g" sxiv.1 \
+		>$(DESTDIR)$(MANPREFIX)/man1/sxiv.1
 	chmod 644 $(DESTDIR)$(MANPREFIX)/man1/sxiv.1
 	@echo "INSTALL share/sxiv/"
 	mkdir -p $(DESTDIR)$(PREFIX)/share/sxiv/exec
@@ -60,9 +91,5 @@ uninstall:
 	@echo "REMOVE share/sxiv/"
 	rm -rf $(DESTDIR)$(PREFIX)/share/sxiv
 
-.PHONY: all clean install uninstall
-.SUFFIXES:
-$(V).SILENT:
-
 -include $(DEP)
 
diff --git a/config.mk b/config.mk
deleted file mode 100644
index b083388..0000000
--- a/config.mk
+++ /dev/null
@@ -1,18 +0,0 @@
-PREFIX    := /usr/local
-MANPREFIX := $(PREFIX)/share/man
-
-CC        ?= gcc
-CFLAGS    += -std=c99 -Wall -pedantic
-CPPFLAGS  += -I/usr/include/freetype2 -D_XOPEN_SOURCE=700
-DEPFLAGS  := -MMD -MP
-LDFLAGS   += 
-
-# autoreload backend: inotify/nop
-AUTORELOAD := inotify
-
-# enable features requiring giflib (-lgif)
-HAVE_GIFLIB := 1
-
-# enable features requiring libexif (-lexif)
-HAVE_LIBEXIF := 1
-