Curtis Gedak authored Jan 30, 2018 and Mike Fleetwood committed Feb 08, 2018

Scrollkeeper and the associated OMF catalog files are used by the
GNOME 2 version of yelp to display the GParted help manual.  To see how
this works try the following command:

  yelp ghelp:gparted

GNOME version 3 and higher yelp do not require scrollkeeper or the OMF
catalog files to properly display the GParted help manual.  And in fact
GNOME 3 deprecated the GNOME 2 method of building and installing GNOME
help documents altogether; including use of GNOME_DOC_INIT autoconf
macro, the gnome-doc-utils package and use of scrollkeeper.

  [GNOME 3] GNOME Goal: Port To New Documentation Infrastructure
  https://wiki.gnome.org/Initiatives/GnomeGoals/NewDocumentationInfrastructure

Further, the next release of Debian, Debian 10 (Buster), will be
removing the scrollkeeper / rarian package.

  rarian: Don't release with Buster
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=885657

GParted is still a GNOME 2 app using GNOME 2 documentation build system
using autoconf GNOME_DOC_INIT macro.

  [GNOME 2] Migrating your documentation to gnome-doc-utils
  https://wiki.gnome.org/Projects/GnomeDocUtils/MigrationHowTo

This is needed to build GParted documentation on still supported GNOME 2
distributions RHEL / CentOS 6.  So avoid requiring deprecated
scrollkeeper on GNOME 3 by automatically disabling scrollkeeper database
updates when the scrollkeeper-update command is not available.

  Executable          | Configure option used  | Use scrollkeeper
  scrollkeeper-update | on command line        | when building help
  exists?             |                        | for GParted?
  --------------------+------------------------+-------------------
  Yes                 | <none>                 | Yes
  Yes                 | --enable-scrollkeeper  | Yes
  Yes                 | --disable-scrollkeeper | No
                      |                        |
  No                  | <any>                  | No

Note that because GParted is still using the GNOME 2 documentation build
system it still builds and installs OMF files.  It is just that they are
not required with GNOME 3 yelp and this commit automatically disables
updating the scrollkeeper database when the scrollkeeper-update command
is not available.

Bug 743318 - configure script missing check for scrollkeeper dependency