Description of problem:
Trying to install mod_auth_kerb fails:

# LANG=C yum install mod_auth_kerb
Loaded plugins: langpacks, rhnplugin
This system is receiving updates from RHN Classic or Red Hat Satellite.
Resolving Dependencies
--> Running transaction check
---> Package mod_auth_kerb.x86_64 0:5.4-28.el7 will be installed
--> Processing Dependency: httpd-mmn = 20120211-x86-64 for package: mod_auth_kerb-5.4-28.el7.x86_64
--> Finished Dependency Resolution
Error: Package: mod_auth_kerb-5.4-28.el7.x86_64 (oraclelinux7-x86_64)
           Requires: httpd-mmn = 20120211-x86-64
           Installed: httpd-2.4.6-45.0.1.el7.x86_64 (@oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
           Available: httpd-2.4.6-17.0.1.el7.x86_64 (oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
           Available: httpd-2.4.6-18.0.1.el7_0.x86_64 (oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
           Available: httpd-2.4.6-19.0.1.el7_0.x86_64 (oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
           Available: httpd-2.4.6-31.0.1.el7.x86_64 (oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
           Available: httpd-2.4.6-31.0.1.el7_1.1.x86_64 (oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
           Available: httpd-2.4.6-40.0.1.el7.x86_64 (oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
           Available: httpd-2.4.6-40.0.1.el7_2.1.x86_64 (oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
           Available: httpd-2.4.6-40.0.1.el7_2.4.x86_64 (oraclelinux7-x86_64)
               httpd-mmn = 20120211
               httpd-mmn = 20120211x8664
               httpd-mmn = 20120211-x86-64
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

Matching packages are there, but not regarded as being compatible. It turns out it is a space added to "20120211-x86-64". Comparison is therefor not with "20120211-x86-64" solely, but against "20120211-x86-64 ". It does not match. Cant install package.

Version-Release number of selected component (if applicable):
see above

How reproducible:
Always. Found bug with:
- Fedora 24,25,rawhide
- RHEL 7
- CentOS 7
- Oracle Linux 7

Steps to Reproduce:
1. Install OS, then install "yum install httpd"
2. Try to install mod_auth_kerb: "yum install mod_auth_kerb"

Actual results:
Install fails, because no compatible httpd install found available.

Expected results:
Just install module, because the installed httpd matches:
httpd-mmn = 20120211-x86-64 -> from Apache
httpd-mmn = 20120211-x86-64 -> from Module

Additional info:
Seems to compare:
httpd-mmn = "20120211-x86-64"  -> from Apache against
httpd-mmn = "20120211-x86-64 " -> from Module

These do not match. Think it is a bug within mod_auth_kerb-module rpm.