[MacPorts] #58480: chasen-base @2.3.3: can't build on macOS 10.14 Mojave

[MacPorts]

#58480: chasen-base @2.3.3: can't build on macOS 10.14 Mojave
--------------------------+-------------------------
 Reporter:  chrstphrchvz  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.5.4
 Keywords:                |       Port:  chasen-base
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 First noticed this in an the Azure builds:
 https://paste.z0k.xyz/d52c7a4964e9 (the build for 10.13 High Sierra
 succeeded though: https://paste.z0k.xyz/701be7feaf54). I was able to
 reproduce this on my machine after disabling ccache (#58479); will attach
 main.log.

 {{{
 /usr/bin/clang++ -dynamiclib -flat_namespace -undefined suppress -o
 .libs/libchasen.0.0.1.dylib  block.lo chalib.lo connect.lo dartsdic.lo
 getid.lo getopt.lo grammar.lo init.lo iotool.lo jfgets.lo katuyou.lo
 lisp.lo literal.lo mmap.lo parse.lo print.lo tokenizer.lo
 -L/opt/local/lib -liconv -lc -headerpad_max_install_names -syslibroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk
 -install_name  /opt/local/lib/libchasen.0.dylib -compatibility_version 1
 -current_version 1.1
 clang: error: unknown argument: '-syslibroot'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58480>
MacPorts <https://www.macports.org/>
Ports system for macOS