[MacPorts] #61250: cdrtools @3.01_0: build failure with Xcode 12

[MacPorts]

#61250: cdrtools @3.01_0: build failure with Xcode 12
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  Reporter:  Xof       |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.3
Resolution:            |   Keywords:
      Port:  cdrtools  |
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Comment (by chrstphrchvz):

 I'm guessing the problem is all the `exit()` usage without the requisite
 `#include <stdlib.h>` in `autoconf/configure`. Is there an easy way to
 generate `autoconf/configure` that will work, or is patching in `#include
 <stdlib.h>` the way to go?

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Ticket URL: <https://trac.macports.org/ticket/61250#comment:4>
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