[MacPorts] #57143: Unable to determine location of a macOS SDK

[MacPorts]

#57143: Unable to determine location of a macOS SDK
------------------------+----------------------------
  Reporter:  ivanatina  |      Owner:  jmroot
      Type:  defect     |     Status:  closed
  Priority:  Normal     |  Milestone:  MacPorts 2.6.0
 Component:  base       |    Version:  2.5.99
Resolution:  fixed      |   Keywords:
      Port:             |
------------------------+----------------------------

Comment (by czender):

 After being forced to upgrade from port 2.5.4 (I think) to port 2.6.0 and
 to Xcode 11 a few days ago, I started receiving this error when upgrading
 ports:
 {{{
 Warning: Unable to determine location of the macOS 10.14 SDK.  Using the
 default macOS SDK.
 }}}
 Simultaneously (so far as I can determine) the gcc9 port (which updated
 from gcc 9.1 to 9.2 at the same time) started failing to link. Compiling
 and linking a trivial testfile conftest.c (which autoconf does a lot of)
 fails,  i.e.,
 {{{
 gcc-mp-9 conftest.c
 }}}
  fails with
 {{{
 ld: library not found for -lSystem
 }}}
 Do  you think this problem is related to this ticket or should I open a
 new ticket or ...?

-- 
Ticket URL: <https://trac.macports.org/ticket/57143#comment:19>
MacPorts <https://www.macports.org/>
Ports system for macOS