stunnel in RHEL 6.7 does not support TLS v1.2

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Issue

In order to be PCI DSS 3.1 compliant, TLS v1.2 support is required for stunnel. However, if sslVersion option is configured as follows in the stunnel.conf file:

sslVersion = TLSv1.2

stunnel fails with the following error:

Starting stunnel: file stunnel.conf line 10: Incorrect version of SSL protocol

Environment

RHEL 6.7, stunnel-4.29-3.el6_6.1

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