Problem building gtk+ programs on Slack 12.2

intens · 01-03-2009, 08:44 AM

Hi

I hope someone here could give a hint in this:

Since I updated to Slack 12.2 I couldn't build GTK+ applications anymore (Sylpheed for example). As an example, when trying to compile this test program

Code:

#include <gtk/gtk.h>
int main(void) {
gtk_main_quit();
return 0;
}

using this commandline

Code:

gcc `pkg-config --libs --cflags gtk+-2.0` test.c

the following error is thrown:

Code:

/usr/lib/gcc/i486-slackware-linux/4.2.4/../../../libcairo.so: undefined reference to `png_set_expand_gray_1_2_4_to_8'
collect2: ld returned 1 exit status

The problem seems to be that libpng isn't linked, because

Code:

$ pkg-config --libs gtk+-2.0
-lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lpango-1.0 -lcairo -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0

I can fix it by adding libpng to the Required line in /usr/lib/pkgconfig/gtk+-2.0.pc manually, but that can't be the right way, can it?

Could somebody explain, what the problem could be?

This a complete Slack 12.2 installation...

thx

Alien Bob · 01-03-2009, 08:56 AM

Works fine here, Slackware 12.2:

Code:

eha@darkstar:/work$ gcc `pkg-config --libs --cflags gtk+-2.0` test.c
eha@darkstar:/work$ file a.out 
a.out: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), not stripped

And:

Code:

eha@darkstar:/work$ pkg-config --libs gtk+-2.0
-lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lpango-1.0 -lcairo -lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0

Eric

intens · 01-03-2009, 10:28 AM

Thank you, Eric, for trying that.

However I'm confused now... Probably something is messed up with my installation.

Alien Bob · 01-03-2009, 10:39 AM

s/Probably/For sure/

Eric