[MacPorts] #53502: git @2.11.0_1: install +credential_osxkeychain fails

[MacPorts]

#53502: git @2.11.0_1: install +credential_osxkeychain fails
------------------------+-----------------
 Reporter:  mndavidoff  |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  git
------------------------+-----------------
 Installing git with the default `+credential_osxkeychain` variant fails.

 {{{
 $ sudo port -vs install git
 ...
 xinstall:
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_git/git/work/git-2.11.0/contrib/subtree
 /git-subtree.html ->
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_git/git/work/htmldocs
 /git-subtree.html
 Error: Failed to destroot git: xinstall: Unable to create new file for:
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_git/git/work/destroot/opt/local/libexec
 /git-core/, No such file or directory
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_git/git/main.log
 for details.
 }}}

 Installing `git -credential_osxkeychain` succeeds.

 The problem may be related to [[https://github.com/macports/macports-
 ports/commit/663d6d9855c684b7790585ea180c15a57c0bbf39|663d6d9]].

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Ticket URL: <https://trac.macports.org/ticket/53502>
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