Sorry if this is old hat, but I don’t remember seeing it go by. I just went through the exercise of getting Lady Heather working on MacOS X. It’s not a Quartz port - you have to install and run XQuartz for it to work. One patch to heather.ch was needed: Right below the include of fcntl.h: #ifndef SOCK_NONBLOCK #define SOCK_NONBLOCK O_NONBLOCK #endif And then this Makefile: CFLAGS+= -I/opt/X11/include -D__linux__ -Wno-write-strings LFLAGS+= -L/opt/X11/lib all: heather heather.o: heather.cpp heather.ch heathfnt.ch makefile g++ $(CFLAGS) -c heather.cpp heathmsc.o: heathmsc.cpp heather.ch heathfnt.ch makefile g++ $(CFLAGS) -c heathmsc.cpp heathui.o: heathui.cpp heather.ch heathfnt.ch makefile g++ $(CFLAGS) -c heathui.cpp heathgps.o: heathgps.cpp heather.ch heathfnt.ch makefile g++ $(CFLAGS) -c heathgps.cpp heather: heather.o heathmsc.o heathui.o heathgps.o g++ $(LFLAGS) heather.o heathui.o heathgps.o heathmsc.o -o heather -lm -lX11 clean: rm heather.o heathui.o heathgps.o heathmsc.o heather