When running scl enable <collection> bash, a variable $X_SCLS should be filled with a list of collections that are enabled. When calling scl enable for the second time, content of $x_scls is read instead of $X_SCLS. In case of enabling the same collection again, it would lead to running collection's enable scriptlet twice. In some specific cases, this can lead to malformed environment, as one of the basic assumptions of scl-utils is that once collection is enabled, it won't be enabled for the second time.
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux release for currently deployed products. This request is not yet committed for inclusion in a release.
This has been fixed in the lates build scl-utils-20120927-4.el5
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2013-1303.html