[MacPorts] #64969: py310-lz4: fatal error: 'lz4.h' file not found

[MacPorts]

#64969: py310-lz4: fatal error: 'lz4.h' file not found
------------------------+--------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.2
 Keywords:              |       Port:  py-lz4
------------------------+--------------------
 https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/99295/steps
 /install-port/logs/stdio
 {{{
 fatal error: 'lz4.h' file not found
 #include <lz4.h>
          ^
 }}}
 Looks like `-I/opt/local/include` is missing in the compile line which
 suggests this build system is not using `CPPFLAGS` like it should. I also
 see `-O3` in the compile line (whereas MacPorts optimization flags should
 be `-Os` by default) and I do not see any `-arch` flags (which should be
 there) suggesting this build system isn't using `CFLAGS` either.

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Ticket URL: <https://trac.macports.org/ticket/64969>
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