The glade-devel package contains libraries and header files for developing applications that use Glade widget library.
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Glade is a RAD tool to enable quick and easy development of user interfaces for the GTK+ toolkit and the GNOME desktop environment. The user interfaces designed in Glade are saved as XML, which can be used in numerous programming languages including C, C++, C#, Vala, Java, Perl, Python, and others.