(In reply to comment #0)
> Description of problem:
> While repackaging libjpeg-turbo for RHEL6, I noted a couple of problems.
> 
> First, I don't think the Provides: for "libjpeg" are quite right; they
> should include the dist tag.  Plus you forgot to provide the isa-specific
> variant.
> This can be fixed along the lines of
> 
>  Obsoletes:	libjpeg < 6b-47
>  # add provides (even if it not needed) to workaround bad packages, like
>  # java-1.6.0-openjdk (#rh607554) -- atkac
> -Provides:	libjpeg = 6b-47
> +Provides:	libjpeg = 6b-47%{?dist}
> +%if "%{?_isa}" != ""
> +Provides:	libjpeg%{_isa} = 6b-47%{?dist}
> +%endif
>  
>  Patch0:		libjpeg-turbo12-noinst.patch
>  
> and
> 
>  %package devel
>  Summary:	Headers for the libjpeg-turbo library
>  Group:		Development/Libraries
>  Obsoletes:	libjpeg-devel < 6b-47
> -Provides:	libjpeg-devel = 6b-47
> +Provides:	libjpeg-devel = 6b-47%{?dist}
>  %if "%{?_isa}" != ""
> -Provides:	libjpeg-devel%{_isa} = 6b-47
> +Provides:	libjpeg-devel%{_isa} = 6b-47%{?dist}
>  %endif
>  Requires:	libjpeg-turbo%{?_isa} = %{version}-%{release}
>  
> and
> 
>  %package static
>  Summary:	Static version of the libjpeg-turbo library
>  Group:		Development/Libraries
>  Obsoletes:	libjpeg-static < 6b-47
> -Provides:	libjpeg-static = 6b-47
> +Provides:	libjpeg-static = 6b-47%{?dist}
>  %if "%{?_isa}" != ""
> -Provides:	libjpeg-static%{_isa} = 6b-47
> +Provides:	libjpeg-static%{_isa} = 6b-47%{?dist}
>  %endif
>  Requires:	libjpeg-turbo-devel%{?_isa} = %{version}-%{release}
>  
> While this is no longer terribly important for Fedora itself, I think it is
> critical that we have this right (not only mostly right) for RHEL7.

Right you are, thanks for report & patch.

> Second, the packaging of the "new API" libturbojpeg is really quite bogus:
> 
> %files -n turbojpeg
> %{_libdir}/libturbojpeg.so
> 
> %files -n turbojpeg-devel
> %{_includedir}/turbojpeg.h
> 
> Surely the base package should contain a version-numbered .so, and
> "libturbojpeg.so" should be a symlink provided only in the -devel package.

Reported to upstream, I'm not going to include downstream patch for this:

https://sourceforge.net/p/libjpeg-turbo/feature-requests/16

> Version-Release number of selected component (if applicable):
> libjpeg-turbo-1.2.1-2.fc18
> 
> How reproducible:
> 100%
> 
> Steps to Reproduce:
> 1. Compare --provides of current packages to those of libjpeg packages they
> replaced.
> 2. Inspect contents of turbojpeg packages.

libjpeg-turbo-1.2.1-3.fc18 has been submitted as an update for Fedora 18.
https://admin.fedoraproject.org/updates/libjpeg-turbo-1.2.1-3.fc18

Package libjpeg-turbo-1.2.1-3.fc18:
* should fix your issue,
* was pushed to the Fedora 18 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing libjpeg-turbo-1.2.1-3.fc18'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-16403/libjpeg-turbo-1.2.1-3.fc18
then log in and leave karma (feedback).

libjpeg-turbo-1.2.1-3.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.