After upgrading to sys-apps/util-linux-2.30.2 the command "pg" has disappeared. The only pg-related file installed is /usr/share/doc/util-linux-2.30.2/pg.txt.bz2 but the executable and man page are not installed anymore.
https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?id=00971cca8a270b6e162c977182d134a64bbc914a https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?id=956e582874d3a28434018bf12057c745f74821de Upstream says you should use less(1) or more(1) instead.
What about a use flag to enable pg? It is there, just not building it by default.
Sorry, unless anyone can tell us a reason why "pg" is still useful and less/more is no complete replacement we will stick with upstream decision and don't provide pg binary anymore.