[MacPorts] #59313: asco port installation fails with 'malloc.h' file not found

[MacPorts]

#59313: asco port installation fails with 'malloc.h' file not found
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  Reporter:  hadrabap  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  mojave, Xcode11
      Port:  asco      |
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Comment (by kencu):

 We have decided to solve the missing-sdk problem by harmonizing the build
 environment to require the command line tools be installed; it was the
 only workable solution to the problem at present.

 If you take 5 minutes to install the command line tools, you should find
 that this, and many similar errors, disappear.

 Please report back with success or failure after doing that.

 Thanks!

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Ticket URL: <https://trac.macports.org/ticket/59313#comment:1>
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