[MacPorts] #61217: libxls @1.6.1: syntax error near unexpected token `, '

[MacPorts]

#61217: libxls @1.6.1: syntax error near unexpected token `,'
--------------------------+-------------------------
 Reporter:  chrstphrchvz  |      Owner:  NicosPavlov
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.6.3
 Keywords:                |       Port:  libxls
--------------------------+-------------------------
 `libxls` fails to configure regardless of OS version (see
 https://ports.macports.org/port/libxls/builds)
 {{{
 ./configure: line 17118: syntax error near unexpected token `,'
 ./configure: line 17118: `AX_CXX_COMPILE_STDCXX_11(, optional)'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61217>
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