[MacPorts] #62075: fossil @2.13 crashes when cloning a specific repository on Big Sur - missing _strstr in tcl library

[MacPorts]

#62075: fossil @2.13 crashes when cloning a specific repository on Big Sur -
missing _strstr in tcl library
-------------------------+----------------------
  Reporter:  snowflake   |      Owner:  ci42
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.99
Resolution:              |   Keywords:
      Port:  fossil tcl  |
-------------------------+----------------------

Comment (by jmroot):

 That looks rather like the configuration bug that was affecting tcl
 previously, caused by implicit declarations in the test code used by the
 configure script.

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Ticket URL: <https://trac.macports.org/ticket/62075#comment:1>
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