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Asked: 2026-05-26T22:56:41+00:00

So I was merrily learning GTK+ programming with 3.0 in Ubuntu 11.04, and even

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So I was merrily learning GTK+ programming with 3.0 in Ubuntu 11.04, and even got a working ruler program running. It compiled with my makefile perfectly.

I took some time away from it, upgraded to 11.10, and now have come back to it. But, alas, when I try to build the program, I get a lot of “undefined reference” errors to pretty much every gtk call in my program. Compiling is fine – the issue is at link time.

The project can be found here: https://github.com/zjmichen/ruler

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1 Answer

  1. Editorial Team

    I’ve tested it and it compiled fine.

    superman@superman-mint ~/work/zjmichen-ruler-e783fe1 $ make
gcc -c -Wall `pkg-config --cflags --libs gtk+-3.0` main.c
gcc -c -Wall `pkg-config --cflags --libs gtk+-3.0` window.c
gcc -c -Wall `pkg-config --cflags --libs gtk+-3.0` graphics.c
gcc -c -Wall `pkg-config --cflags --libs gtk+-3.0` mouse.c
gcc `pkg-config --cflags --libs gtk+-3.0` main.o window.o graphics.o mouse.o -o zruler
superman@superman-mint ~/work/zjmichen-ruler-e783fe1 $

    But this was on Linux Mint. Here you’ve got the arguments produced by pkg-config

    -pthread -DGSEAL_ENABLE -I/usr/include/atk-1.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/gtk-3.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pixman-1  -pthread -L/usr/lib/x86_64-linux-gnu -lgtk-3 -lgdk-3 -latk-1.0 -lcairo-gobject -lgio-2.0 -lpangoft2-1.0 -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lm -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0 -lrt -lglib-2.0

    I’ve also did a quick test on Ubuntu 11.10 and indeed it doesn’t compile. I’ll take a better look this evening.

    So I did test it on Ubuntu and changed the line 14 in the makefile to

    $(CC) $(OBJS) $(GTKFLAGS) -o $(NAME)

    this changes the order of object files and libraries that are being linked. I have no idea why this problem occurs on the new Ubuntu. Maybe it is because it is a different version of gcc. On my linux mint gcc is version 4.5.2 on ubuntu 11.10 it is 4.6.1

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