PREFIX=/usr
GLADEPATH=$(PREFIX)/share/librecgm/gui.glade
CFLAGS=-g3 -Wall -Wextra -DGLADEPATH='"$(GLADEPATH)"'
OBJ=findrect.o img.o read.o main.o cam.o gui.o data.o

optionallibs=$(shell pkg-config --libs $(1) 2> /dev/null)
optionalcflags=$(shell pkg-config --cflags $(1) 2> /dev/null && echo '-DENABLE_$(2)' || echo 'Warning: building without $(3) due to missing one or more of $(1)' >&2)
# Labels
LIBS+=$(call optionallibs,freetype2 fontconfig)
CFLAGS+=$(call optionalcflags,freetype2 fontconfig,LABELS,labels)
# Webcam
LIBS+=$(call optionallibs,libv4l2)
CFLAGS+=$(call optionalcflags,libv4l2,V4L2,webcam support)
# GUI
LIBS+=$(call optionallibs,gtk+-3.0)
CFLAGS+=$(call optionalcflags,gtk+-3.0,GUI,GUI)
# Image formats (beyond PNM)
LIBS+=$(call optionallibs,gdk-pixbuf-2.0)
CFLAGS+=$(call optionalcflags,gdk-pixbuf-2.0,GDKPIXBUF,support for more image formats)

librecgm: $(OBJ)
	$(CC) $^ $(LIBS) -o $@

install: librecgm gui.glade
	install -D -m 755 $< $(DESTDIR)$(PREFIX)/bin/$<
	install -D -m 644 gui.glade $(DESTDIR)$(PREFIX)/share/librecgm/gui.glade

clean:
	rm -f librecgm $(OBJ)