boa tarde, sou novo por aqui utilizo o fedora 17
não sei pq da esse erro

[fabricio@fabricio Layout]$ php-gtk2 somar.php
Gtk-Message: Failed to load module "pk-gtk-module"
Gtk-Message: Failed to load module "atk-bridge"

(somar.php:1807): libglade-WARNING **: Expected <glade-interface>. Got <interface>.

(somar.php:1807): libglade-WARNING **: did not finish in PARSER_FINISH state

Fatal error: Uncaught exception 'PhpGtkConstructException' with message 'could not construct GladeXML object' in /home/fabricio/Documentos/Calculadora/calculadora/Layout/somar.php:2
Stack trace:
#0 /home/fabricio/Documentos/Calculadora/calculadora/Layout/somar.php(2): GladeXML->__construct('teste.glade')
#1 {main}
thrown in /home/fabricio/Documentos/Calculadora/calculadora/Layout/somar.php on line 2

É um bug do Fedora 17 64 bits.

Eis a correção

% wget http://dl.fedoraproject.org/pub/fedora/linux/releases/16/Fedora/x86_64/os/Packages/PackageKit-gtk-module-0.6.19-3.fc16.x86_64.rpm

% rpm2cpio PackageKit-gtk-module-0.6.19-3.fc16.x86_64.rpm | cpio -idmv

% sudo mv ./usr/lib64/gtk-2.0/modules/libpk-gtk-module.so /usr/lib64/gtk-2.0/modules/