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Description of problem:
libcom_err-devel in RHEL6.7 does not provide /usr/include/com_err.h which causes trouble for various applications (including sssd)

Steps to reproduce (after bug #1170272 ("[RFE] Add LocalAuth plugin API") lands):
Try to compile this testcase...
-- snip --
#include <krb5/krb5.h>
#include <krb5/localauth_plugin.h>
int main(int ac, char *av[]) { return 0; }
-- snip --
... it will fail with:
-- snip --
/usr/include/kadm5/admin.h:48:28: error: com_err.h: No such file or directory
-- snip --

The same will happen with the sssd build in RHEL6.7:
-- snip --
configure:21977: checking for krb5/localauth_plugin.h
configure:22003: gcc -c -O0 -ggdb -pipe -Wall -Wextra -Wshadow -Wformat -Wformat-security -Werror=unused-function -Wunused-variable -Wno-unused-parameter -Wno-sign-compare -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE   conftest.c >&5
In file included from /usr/include/krb5/localauth_plugin.h:65,
                 from conftest.c:126:
/usr/include/kadm5/admin.h:48:28: error: com_err.h: No such file or directory
-- snip --

Suggested fix:
Backport newest libcom_err package version to RHEL6.7

COM_ERR(3)                                                          COM_ERR(3)

NAME
       com_err - common error display routine

SYNOPSIS
        #include <et/com_err.h>



# rpm -qpl libcom_err-devel-1.41.12-21.el6.x86_64.rpm | grep include
/usr/include/et
/usr/include/et/com_err.h

Somebody is including the wrong header file path, but that's not an e2fsprogs bug.

and pkg-config returns correct location of header files.

bash-4.1# pkg-config --cflags com_err
-I/usr/include/et  

bash-4.1# rpm -q libcom_err-devel
libcom_err-devel-1.41.12-21.el6.x86_64

I think the biggest question is why does krb5 need the header at all? It's not required in el7..