Unable to install gtk2

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1

I am learning to program in C and I need to have gtk2 installed in order to access the gtk library. When I run the command sudo zypper search gtk the output shows that the gtk2-tools is installed. I am currently running OpenSUSE 15.1 with a KDE desktop environment. Thank you in advance for your assistance.

2

Hi
If you use a wildcard for searching, plus if programming, then your after the development package, gtk2-devel to be installed.


zypper se gtk*devel

You should not need to use sudo for searches and also only develop as your user, become root to install :wink:

3

malcolmlewis,
Thank you for your assistance. That is what I was looking for to fix my problem. I also appreciate your guidance on the use of sudo.

4

Now that I have the gtk library installed I am having trouble compiling my code. In OpenSUSE the gtk.h file is located at /usr/include/gtk-2.0/gtk/gtk.h. I have added this location to my code but I an still getting the following error.

In file included from chapter14.c:1:0:
/usr/include/gtk-2.0/gtk/gtk.h:32:21: fatal error: gdk/gdk.h: No such file or directory
compilation terminated.

How do I fix this issue?

5

Hi
In your code you should just have the following?


#include <gtk-2.0/gtk/gtk.h>
#include <gtk-2.0/gtk/gdk.h>

Both headers and in the gtk directory, can you confirm?

6

Check permissions.

7

malcolmlewis,
The headers are in different directories. Under the gtk-2.0 directory there is a gdk directory and a gtk directory. Each header is located in the respective directory.

What should the permissions be for each file?

8

Hi
So what does your code look like?

Normally the makefile should automatically add the /usr/include, so it would be;


#include <gtk-2.0/gtk/gtk.h>
#include <gtk-2.0/gdk/gdk.h>
9

I am following a a guide from Raspberry Pi, *C GUI Programming. *I do not have a make file. The guide explains that I should be able to compile my code. My code is shown below.


#include <gtk-2.0/gtk/gtk.h>
#include <gtk-2.0/gdk/gdk.h>

int main (int argc, char *argv])
{
        gtk_init (&argc, &argv);
        GtkWidget *win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
        gtk_widget_show (win);
        gtk_main();
        return 0;
}
10

Hi
If you run;


pkg-config --cflags --libs gtk+-2.0

I suspect the gtk-2.0 is already in the include directory, so remove that from the #include line


#include <gtk/gtk.h>
#include <gdk/gdk.h>
11

You are correct, the gtk-2.0 directory is in the include directory. I ran the pkg-config command that you recommended, but I still received the error. It appears that the directory tree that each header file is looking for is different than their actual location. I started editing each header file as an error appeared by adding the parent directory but for each one that I fix another error shows up. There has to be a better way to fix this problem.

12

Hi
Welcome to the world of cross-distribution coding… :wink: You can use the likes of find and sed to go through and make the changes globally.

13

Great, I must be sick or demented but I still enjoy it even if I do end up pulling my hair out. :beat-up: I am not familiar with the use of sed. I will do some research and see what I can find.

14

Hi
So is it just those particular headers or other ones as well?

Create a test folder to work on and use something like;


find ./ -type f -exec sed -i 's/\/gtk.h/\/gtk\/gtk.h/g' {} \;
15

After some work I have managed to compile my code. By adding using the following command, which you recommended before, but I added it to the end of my gcc command as shown below. I had tried this before but I was using the wrong punctuation around the pkg-config. Thank you for all of your assistance. :slight_smile:

gcc -o myprog14 chapter14.c `pkg-config --cflags --libs gtk+-2.0`
16

Hi
Good job :slight_smile: But yes those sorts of things are taken care of by the likes of a Makefile and configure (autotools) scripts… :wink: