[MacPorts] #53839: nco +gcc6 failing to build with missing symbols from antlr

[MacPorts]

#53839: nco +gcc6 failing to build with missing symbols from antlr
---------------------+-----------------------
 Reporter:  gnurser  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.4.1
 Keywords:  sierra   |       Port:  nco +gcc6
---------------------+-----------------------
 '''Mac OS 10.12.3, Xcode 8.2.1 with gcc6 @6.3.0_2, openmpi-gcc6
 '''


 nco build fails at linking stage with missing antlr symbols. First
 error:[[BR]]

 :info:build libtool: link: /opt/local/bin/g++-mp-6 -pipe -Os
 -Wl,-headerpad_max_install_names -o ncap2 Invoke.o ncap2.o ncap2_utl.o
 ncap2_att.o sdo_utl.o sym_cls.o fmc_cls.o fmc_all_cls.o fmc_gsl_cls.o
 prs_cls.o NcapVar.o NcapVarVector.o ncoLexer.o ncoParser.o ncoTree.o
 nco_gsl.o  -L../nco [[BR]]
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_science_nco/nco/work/nco-4.6.4/src/nco/.libs/libnco.a
 -L/opt/local/lib -lantlr -lhdf5_hl -lhdf5 -ldl -lz -lxerces-c -lvecLibFort
 -lexpat -lresolv -lintl -lm -lnetcdf -lcurl -lgsl -lgslcblas -ludunits2
 -fopenmp[[BR]]

 :info:build Undefined symbols for architecture x86_64:[[BR]]

 :info:build   "antlr::ASTFactory::create(int,
 std::__cxx11::basic_string<char, std::char_traits<char>,
 std::allocator<char> > const&)", referenced from:[[BR]]

 :info:build       ncoParser::dmn_list_p()      in ncoParser.o

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Ticket URL: <https://trac.macports.org/ticket/53839>
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