After recent upgrade of GNOME related packages, the proxy configuration of pidgin is not usable anymore and the following error message is displayed in Preferences → Proxy: « Proxy configuration program was not found. »
severity 650274 minor forwarded 650274 http://developer.pidgin.im/ticket/13882#comment:6 thanks You can still get to the GNOME proxy settings from the control center or the network-manager applet; it's just the link from pidgin that's broken.