libgconf2-dev 3.2.6-6ubuntu1 (arm64 binary) in ubuntu focal

 GConf is a configuration database system for storing application
 preferences. It supports default or mandatory settings set by the
 administrator, and changes to the database are instantly applied to all
 running applications. It is written for the GNOME desktop but doesn't
 require it.
 .
 This package contains the static libraries and header files needed to
 build applications using GConf.
 .
 This package is for legacy applications and no longer used by GNOME.