[MacPorts] #57323: libpftputil @0.3 mojave build fails due to unrecognized -syslibroot option to clang

[MacPorts]

#57323: libpftputil @0.3 mojave build fails due to unrecognized -syslibroot option
to clang
---------------------+-------------------------
 Reporter:  rlhamil  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.5.4
 Keywords:           |       Port:  libpftputil
---------------------+-------------------------
 :info:build /usr/bin/clang -r -keep_private_externs -nostdlib -o
 .libs/libpftputil.0.0.3.dylib-master.o  editconf.lo pftp_client.lo
 pftp_default.lo pftp_item.lo pftp_getconf.lo gethosts.lo getline.lo
 pftputil.lo parse_utils.lo patternmatch.lo pftp_que.lo set_utils.lo
 setconf.lo sethosts.lo pftp_settings.lo pftputil_settings.lo str.lo &&
 /usr/bin/clang -dynamiclib -flat_namespace -undefined suppress -o
 .libs/libpftputil.0.0.3.dylib .libs/libpftputil.0.0.3.dylib-master.o
 -L/opt/local/lib -lssl -lcrypto -lresolv -lc -headerpad_max_install_names
 -syslibroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk
 -headerpad_max_install_names -syslibroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk
 -install_name /opt/local/lib/libpftputil.0.dylib -compatibility_version 1
 -current_version 1.3
 :info:build clang: error: unknown argument: '-syslibroot'
 :info:build clang: error: unknown argument: '-syslibroot'
 :info:build make[2]: *** [libpftputil.la] Error 1
 :info:build make[2]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_net_libpftputil/libpftputil/work/libpftputil-0.3/src'
 :info:build make[1]: *** [all] Error 2
 :info:build make[1]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_net_libpftputil/libpftputil/work/libpftputil-0.3/src'
 :info:build make: *** [all-recursive] Error 1
 :info:build make: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_net_libpftputil/libpftputil/work/libpftputil-0.3'
 :info:build Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_net_libpftputil/libpftputil/work/libpftputil-0.3"
 && /usr/bin/make -j8 -w all
 :info:build Exit code: 2
 :error:build Failed to build libpftputil: command execution failed

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Ticket URL: <https://trac.macports.org/ticket/57323>
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