[MacPorts] #59235: MacVim fails to build on macOS 10.15 Catalina

[MacPorts]

#59235: MacVim fails to build on macOS 10.15 Catalina
---------------------+----------------------
  Reporter:  moyang  |      Owner:  raimue
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.1
Resolution:          |   Keywords:
      Port:  MacVim  |
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Comment (by mliker):

 I believe the patch error only happens when there was already a previous
 unsuccessful build. The actual error is below. I don't get a patch error
 when I run {{{ port clean MacVim }}} before running {{{ port upgrade
 MacVim }}}

 {{{
 :info:patch --->  Running ibtool for Preferences.nib
 :debug:patch system -W
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_editors_MacVim/MacVim/work/macvim-155:
 ibtool --compile src/MacVim/English.lproj/Preferences.nib/keyedobjects.nib
 src/MacVim/English.lproj/Preferences.nib
 :info:patch xcode-select: error: tool 'ibtool' requires Xcode, but active
 developer directory '/Library/Developer/CommandLineTools' is a command
 line tools instance
 :info:patch Command failed: ibtool --compile
 src/MacVim/English.lproj/Preferences.nib/keyedobjects.nib
 src/MacVim/English.lproj/Preferences.nib
 }}}

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Ticket URL: <https://trac.macports.org/ticket/59235#comment:4>
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