A new update is available for Fedora Core - Fedora Core 4 Update: xinitrc-4.0.18.1-1. Here the announcement:

Fedora Update Notification
FEDORA-2005-924
2005-09-23
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Product : Fedora Core 4
Name : xinitrc
Version : 4.0.18.1
Release : 1
Summary : The default startup script for the X Window System.
Description :
The xinitrc package contains the xinitrc file, a script which is used
to configure your X Window System session or to start a window
manager.

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Update Information:

The xinitrc package is a collection of startup scripts
and config files for the X Window System.

A new feature was added to the xinitrc package in FC-4
to allow 3rd party window managers to be able to drop
in their own custom startup shell scripts, which would
get autodetected and used by xinitrc/Xsession
automatically if present for a given windowmanager or
desktop environment.

This feature was unused in Fedora Core 4 itself however,
and recently a flaw was discovered in the implementation.

This update fixes this feature of the xinitrc scripts
to allow 3rd party window managers and desktop
environments to easily integrate with the X startup
process.
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* Fri Sep 23 2005 Mike A. Harris <mharris@redhat.com> 4.0.18.1-1
- Backport all of 4.0.20-1 from Fedora devel head to xinitrc-fc4-branch
for FC4 update, to fix (#168634)

* Fri Sep 23 2005 Mike A. Harris <mharris@redhat.com> 4.0.20-1
- Fix glitch in Xsession script in implementation of Xclients.d (#168634)

* Tue May 24 2005 Mike A. Harris <mharris@redhat.com> 4.0.19-1
- [xinitrc-common] source /etc/profile.d/lang.sh if it exists to try and fix
bug (#138681)
- Remove unnecessary dependancy on /usr/X11R6/bin/RunWM from spec file
- Do not install RunWM symlinks for window managers we have not shipped for
several years.


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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/4/

3e309143e316534e24250aa6b7b8c5d2 SRPMS/xinitrc-4.0.18.1-1.src.rpm
e987474a5764bafc5a16093f40c74f35 x86_64/xinitrc-4.0.18.1-1.noarch.rpm
e987474a5764bafc5a16093f40c74f35 i386/xinitrc-4.0.18.1-1.noarch.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.