[MacPorts] #59323: jtc @1.7.4: error: invalid value 'c++14' in '-std=c++14'

[MacPorts]

#59323: jtc @1.7.4: error: invalid value 'c++14' in '-std=c++14'
------------------------+-------------------------
 Reporter:  ryandesign  |      Owner:  herbygillot
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.1
 Keywords:              |       Port:  jtc
------------------------+-------------------------
 [https://build.macports.org/builders/ports-10.9_x86_64-builder/builds/101493/steps
 /install-port/logs/stdio error: invalid value 'c++14' in '-std=c++14']:

 {{{
 --->  Building jtc
 DEBUG: Executing org.macports.build (jtc)
 DEBUG: Environment:
 CC_PRINT_OPTIONS='YES'
 CC_PRINT_OPTIONS_FILE='/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_textproc_jtc/jtc/work/.CC_PRINT_OPTIONS'
 CPATH='/opt/local/include'
 DEVELOPER_DIR='/Library/Developer/CommandLineTools'
 LIBRARY_PATH='/opt/local/lib'
 MACOSX_DEPLOYMENT_TARGET='10.9'
 Executing:  cd
 "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_textproc_jtc/jtc/work/jtc-1.74"
 && /usr/bin/clang++ jtc.cpp -o jtc -Wall -std=c++14 -Ofast
 DEBUG: system:  cd
 "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_textproc_jtc/jtc/work/jtc-1.74"
 && /usr/bin/clang++ jtc.cpp -o jtc -Wall -std=c++14 -Ofast
 error: invalid value 'c++14' in '-std=c++14'
 Command failed:  cd
 "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_textproc_jtc/jtc/work/jtc-1.74"
 && /usr/bin/clang++ jtc.cpp -o jtc -Wall -std=c++14 -Ofast
 Exit code: 1
 }}}

 Maybe use `compiler.cxx_standard 2014` to make MacPorts pick a newer
 compiler.

-- 
Ticket URL: <https://trac.macports.org/ticket/59323>
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