I am trying to compile a C GUI application using GTK4. I was previously told here that both Ubuntu 21.04 and 21.10 would have both GTK3 and GTK4. However, when I installed Ubuntu 21.04 only GTK3 was present. I then did a dist-upgrade to 21.10 and found that both versions of GTK are native:
user@user: dpkg -l libgtk* | grep -e '^i' | grep -e 'libgtk-*[0-9]'
ii libgtk-3-0:amd64 3.24.30-1ubuntu1 amd64 GTK graphical user interface library
ii libgtk-3-bin 3.24.30-1ubuntu1 amd64 programs for the GTK graphical user interface library
ii libgtk-3-common 3.24.30-1ubuntu1 all common files for the GTK graphical user interface library
ii libgtk-3-dev:amd64 3.24.30-1ubuntu1 amd64 development files for the GTK library
ii libgtk-3-doc 3.24.30-1ubuntu1 all documentation for the GTK graphical user interface library
ii libgtk-4-1:amd64 4.4.0+ds1-5 amd64 GTK graphical user interface library
ii libgtk-4-bin 4.4.0+ds1-5 amd64 programs for the GTK graphical user interface library
ii libgtk-4-common 4.4.0+ds1-5 all common files for the GTK graphical user interface library
ii libgtk2.0-0:amd64 2.24.33-2ubuntu1 amd64 GTK graphical user interface library - old version
ii libgtk2.0-bin 2.24.33-2ubuntu1 amd64 programs for the GTK graphical user interface library
ii libgtk2.0-common 2.24.33-2ubuntu1 all common files for the GTK graphical user interface library
ii libgtk3-perl 0.038-1 all Perl bindings for the GTK+ graphical user interface library
Just double checking the version of Ubuntu yields:
user@user: lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 21.10
Release: 21.10
Codename: impish
The GTK page says to use the following to compile a GTK4 app using pkg-config:
gcc $( pkg-config --cflags gtk4 ) -o example-0 example-0.c $( pkg-config --libs gtk4 )
This is very similar to previous versions of GTK. For GTK3 it was:
gcc $( pkg-config --cflags gtk+-3.0 ) -o example-0 example-0.c $( pkg-config --libs gtk+-3.0 )
However, trying to compile the program using GTK4 results in:
user@user: make
Package gtk4 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk4.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk4' found
So then based on here I ran:
user@user: pkg-config --variable pc_path pkg-config
/usr/local/lib/x86_64-linux-gnu/pkgconfig:/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig:/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig
Searching all of those paths, I only find GTK related .pc files in /usr/lib/x86_64-linux-gnu/pkgconfig and I do not find anything for GTK4. I do find gtk+-3.0.pc there though. So my question is, if GTK4 is native to Ubuntu 21.10, why would the pkg-config files be missing? Where do I obtain them so I can compile using pkg-config?
ASIDE: I do not have enough reputation to create the gtk4 tag. Could someone with enough reputation do so?
