If you look through the BUG report at the RedHat URL, you can see that there are clues there and it does not seem to be related to just Solaris.

From: bugzilla-daemon@freedesktop.org [mailto:bugzilla-daemon@freedesktop.org]
Sent: Wednesday, January 06, 2016 3:44 PM
To: JONES, BILL
Subject: [Bug 93609] p11-kit on Solaris 10 with GCC4-4.7.2 fails tests for 32bit and 64bit builds

Stef Walter changed bug 93609

What | Removed | Added
Status | NEW | NEEDINFO

Comment # 2 on bug 93609 from Stef Walter

    Would be happy to accept patches. I don't have access to that operating system

    or architecture.

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