[MacPorts] #62430: gobject-introspecion fails to configure

[MacPorts]

#62430: gobject-introspecion fails to configure
---------------------------+-----------------------------------
 Reporter:  arthurcnorman  |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.6.4
 Keywords:                 |       Port:  gobject-introspection
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 This is on x86_64 with Big Sur 11.2.3 and the log file (config.log)
 contains

 configure:18044: checking for headers required to compile python
 extensions
 configure:18054:  -I/opt/local/include
 -isysroot/Applications/Xcode.app/Content
 ./configure: line 1938: -I/opt/local/include: No such file or directory
 configure:18054: $? = 127
 configure: failed program was:
 | /* confdefs.h */
 | #define PACKAGE_NAME "gobject-introspection"
 which I believe is because CPP has got set to be an empty string.

 I worry about the introduction of autoconf 2.71 without providing a way to
 preserve and select autoconf 2.69, because when I reautoconf in gobject-
 introspection there are MANY warning messages...

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Ticket URL: <https://trac.macports.org/ticket/62430>
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