If you're on freshly installed Fedora 23 (x86-64), then dnf install gtk3-devel.x86_64 gets you everything you need to compile a simple Gtk3 application[1]. However on the same host if you do: dnf install gtk3-devel.i686 then there's a lot missing before you can compile a 32 bit Gtk3 application[2]. I had to install the following dependencies (found by tedious trial-and-error) before I could compile it: dnf -y install {pango,pixman,zlib,libpng,expat,mesa-libEGL,libX11,libdrm,libxcb,libXau,libXdamage,libXfixes,libXxf86vm,libXext,mesa-libGL,libXrender,harfbuzz,graphite2,gdk-pixbuf2,atk,cairo-gobject,libXinerama,libXi,libXrandr,libXcursor,libXcomposite,wayland,libwayland-client,libxkbcommon,libwayland-cursor,mesa-libwayland-egl,libepoxy,at-spi2-atk,at-spi2-core,dbus,glib2,glibc}-devel.i686 Is this a bug or is it not expected this would work or I am doing it wrong? Rich. [1] For my test I am using the trivial example from here: https://developer.gnome.org/gtk3/stable/gtk-getting-started.html [2] To compile the 32 bit application I'm using: gcc -m32 trivial.c `PKG_CONFIG_LIBDIR=/usr/lib/pkgconfig:/usr/share/pkgconfig pkg-config --cflags --libs gtk+-3.0` -o trivial -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx http://lists.fedoraproject.org/admin/lists/devel@xxxxxxxxxxxxxxxxxxxxxxx