[SOLVED] "<gtk/gtk.h> not found" when trying to compile C GTK program.

bcsm · 07-25-2021, 10:38 AM

Hi,

I'm on Linux Mint 20.2 Cinnamon, and I have libgtk-3-0 (already present by default) and libgtk-3-dev (via apt on command line) installed. gtk-3.0 is present in usr/include, with gtk, gdk and unix-print folders present inside.

When trying to compile a C program with an empty main() function and the only #include being <gtk/gtk.h>, this error is thrown: "fatal error: gtk/gtk.h: No such file or directory".

I made some progress by doing "#include <gtk-3.0/gtk/gtk.h>", however this just gave this error instead, in gtk.h: "/usr/include/gtk-3.0/gtk/gtk.h:30:10: fatal error: gdk/gdk.h: No such file or directory"

I'm using geany to edit, but using cc and gcc at command line produced the same errors.

How can I fix this? Thank you

EdGr · 07-25-2021, 11:09 AM

Use pkg-config to generate a list of include paths and libraries. See https://developer.gnome.org/gtk3/sta...compiling.html.

As an alternative, autoconf can do all of this for you. Add:

Code:

PKG_CHECK_MODULES(PACKAGE, [
  gtk+-3.0 >= 3.24.0
])

to your configure.ac.
Ed

teckk · 07-25-2021, 11:11 AM

Do you have those header files on your machine?
On this arch machine they are at

Code:

/usr/include/gtk-2.0/gtk/gtk.h
/usr/include/gtk-3.0/gtk/gtk.h

/usr/include/gtk-2.0/gdk/gdk.h
/usr/include/gtk-3.0/gdk/gdk.h

EdGr · 07-25-2021, 11:25 AM

Quote:

Originally Posted by teckk

Do you have those header files on your machine?

Yes, but locations may differ. On Slackware:

Code:

% pkg-config --cflags gtk+-3.0
-pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/libxml2 -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include

Ed

bcsm · 07-25-2021, 12:28 PM

Thank you both! Managed to get it working using link provided by EdGr: https://developer.gnome.org/gtk3/sta...compiling.html

For anyone having the same problem who is new to all of this like me, you can set what the command Geany uses to build the program by going to Build > Set Build Commands, to save you writing it all out on the command line every time. This is what it ended up being for me (for Build, not Compile) gcc "%f" -Wall -o "%e" `pkg-config --cflags --libs gtk+-2.0`

For reference, I did have the header files in the location teckk provided.