[MacPorts] #60310: gnucash @3.9 build failure

[MacPorts]

#60310: gnucash @3.9 build failure
---------------------+---------------------
 Reporter:  hapaguy  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  gnucash
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 I am using the following:
 * `macOS 10.15.4`
 * `Xcode 11.4`
 * `MacPorts 2.6.2`
 The `gnucash` build fails:
 * `sudo port -sv upgrade gnucash`
 * `sudo port -sv install gnucash`
 with missing threads, etc.:
 * `-- Performing Test HAVE_OFX_BUG_39 - Failed`
 * `-- Performing Test have_stringop_truncation - Failed`
 * `-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed`
 * `-- Looking for pthread_create in pthreads - not found`
 * `-- Looking for pthread_create in pthread - not found`
 I have attached the main.log.

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Ticket URL: <https://trac.macports.org/ticket/60310>
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