[Bug 286706] math/lean4: fix build on FreeBSD 13.5

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 10 May 2025 03:47:52 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286706

            Bug ID: 286706
           Summary: math/lean4: fix build on FreeBSD 13.5
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: yuri@freebsd.org
          Reporter: milios@ccsys.com
             Flags: maintainer-feedback?(yuri@freebsd.org)
          Assignee: yuri@freebsd.org
 Attachment #260308 maintainer-approval?
             Flags:

Created attachment 260308
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=260308&action=edit
git -C /usr/ports diff math/lean4

the most recent port update to lean4 wouldnt build on 13.5 due to lack of
clearenv()

i believe this patch provides a suitable stub

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