GTK+ Developer Matthias Clasen gtk-builder-tool 1 User Commands gtk-builder-tool GtkBuilder file utility gtk-builder-tool COMMAND FILE gtk-builder-tool can perform various operations on GtkBuilder .ui files. You should always test the modified .ui files produced by gtk-builder-tool before using them in production. The following commands are understood: validate Validates the .ui file and report errors to stderr. simplify Simplifies the .ui file by removing properties that are set to their default values and write the resulting XML to stdout. enumerate Lists all the named objects that are created in the .ui file.