[MacPorts] #60901: qgis3: fatal error: 'stdlib.h' file not found

[MacPorts]

#60901: qgis3: fatal error: 'stdlib.h' file not found
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  Veence
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.3
 Keywords:              |       Port:  qgis3
------------------------+----------------------
 [https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/88298/steps
 /install-port/logs/stdio qgis3 doesn't build]:

 {{{
 clang: warning: no such sysroot directory:
 '/Applications/Xcode.app/Contents/Developer/Developer/SDKs/MacOSX.sdk'
 [-Wmissing-sysroot]
 }}}
 {{{
 /Library/Developer/CommandLineTools/usr/include/c++/v1/stdlib.h:94:15:
 fatal error: 'stdlib.h' file not found
 #include_next <stdlib.h>
               ^~~~~~~~~~
 }}}


 This is probably because of a change made to configure.sdkroot in
 [f2ee9406fec1b81173f816a180167af810a5e173/macports-ports].

 Why does this portfile override configure.sdkroot anyway? MacPorts base
 should already be setting it for you. Granted there are some bugs in the
 way it does that, but if that's why you're overriding it, we should fix
 whatever it is in MacPorts base instead of individually in each portfile.

-- 
Ticket URL: <https://trac.macports.org/ticket/60901>
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