[MacPorts] #70466: htmldoc @1.9.18 needs a newer version of libcups on macOS 10.11.6

[MacPorts]

#70466: htmldoc @1.9.18 needs a newer version of libcups on macOS 10.11.6
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 Reporter:  snowflake  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.9.99
 Keywords:             |       Port:  htmldoc
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 On my machine with macOS 10.11.6 already has pkgconfig installed, so the
 error in #70465 does not apply.

 The configure phase is displaying this error:
 {{{
 checking for cups-config... /usr/bin/cups-config
 checking for CUPS library v2.2 or higher... no
 configure: error: Sorry, you need CUPS 2.2.0 or higher.
 }}}

 My other machine running macOS 14 successfully builds htmldoc

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Ticket URL: <https://trac.macports.org/ticket/70466>
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