[MacPorts] #59946: scribus-devel @1.5.6.svn-20191204 does not configure if python38 is active

[MacPorts]

#59946: scribus-devel @1.5.6.svn-20191204 does not configure if python38 is active
-----------------------+---------------------------
 Reporter:  snowflake  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.6.99
 Keywords:             |       Port:  scribus-devel
-----------------------+---------------------------
 System
 {{{
 "macports_version": "2.6.99",
     "osx_version": "10.11",
      "cxx_stdlib": "libc++",
     "gcc_version": "9.2.0",
     "xcode_version": "8.2.1",
     "clt_version": "8.2.0.0.1.1480973914"
 }}}

 Configure fails if python38 is active.

 From the log:
 {{{
 TIFF Library Found OK
 Python 3.x Selected
 CMake Error at
 /opt/local/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:146
 (message):
   Could NOT find Python3 (missing: Development) (found version "3.8.1")
 Call Stack (most recent call first):
 /opt/local/share/cmake-3.16/Modules/FindPackageHandleStandardArgs.cmake:393
 (_FPHSA_FAILURE_MESSAGE)
   /opt/local/share/cmake-3.16/Modules/FindPython/Support.cmake:2211
 (find_package_handle_standard_args)
   /opt/local/share/cmake-3.16/Modules/FindPython3.cmake:300 (include)
   CMakeLists_Dependencies.cmake:140 (find_package)
   CMakeLists.txt:358 (include)
 -- Configuring incomplete, errors occurred!
 }}}

 I deactivated python 38, leaving the following active:
 {{{
   python33 @3.3.7_3 (active)
   python34 @3.4.10_3 (active)
   python35 @3.5.9_0 (active)
   python36 @3.6.10_0 (active)
   python37 @3.7.6_0+universal (active)
    python39-devel @3.9.0a2_0 (active)
 }}}

 The configure phase now succeeded.  There was another build failure after
 about 15 minutes, but that is probably the subject of another report.

-- 
Ticket URL: <https://trac.macports.org/ticket/59946>
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