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See upstream fix (~3 years old)
https://github.com/pear/pear-core/commit/39524c33d26d2936f60f046a542f1bf23d875a49

This is un upstream version 1.9.3, while RHEL-6 provides 1.9.4.

Having date.timezone defined in the launcher (pear/pecl) will avoid a lot of warning on a freshly installed system where it is not yet configured (there is no default value for this option).

This have already been changed in Fedora, without any issue.

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.

https://rhn.redhat.com/errata/RHBA-2016-0795.html