antlr-2.6.7 fails to configure

[gpf@…]

---> Configuring antlr Error: Target com.apple.configure returned: configure failure: shell command "cd "/opt/local/var/db/dports/build/_opt_local_var_db_dports_sources_rsync.rsync.darwinports.org_dpupdate_dports_lang_antlr/work/antlr-2.7.6" && CLASSPATH=. ./configure --prefix=/opt/local/var/db/dports/build/_opt_local_var_db_dports_sources_rsync.rsync.darwinports.org_dpupdate_dports_lang_antlr/work/destroot/opt/local" returned error 1 Command output: config.status: creating examples/python/exprAST/Makefile config.status: creating examples/python/filter/Makefile config.status: creating examples/python/filterWithRule/Makefile config.status: creating examples/python/heteroAST/Makefile config.status: creating examples/python/HTML/Makefile config.status: creating examples/python/IDL/Makefile config.status: creating examples/python/imagNodeAST/Makefile config.status: creating examples/python/includeFile/Makefile config.status: creating examples/python/inherit.tinyc/Makefile config.status: creating examples/python/java/Makefile config.status: creating examples/python/lexerTester/Makefile config.status: creating examples/python/lexRewrite/Makefile config.status: creating examples/python/linkChecker/Makefile config.status: creating examples/python/multiLexer/Makefile config.status: creating examples/python/multiParser/Makefile config.status: creating examples/python/parseBinary/Makefile config.status: creating examples/python/pascal/Makefile config.status: creating examples/python/cpp/Makefile config.status: creating examples/python/preserveWhiteSpace/Makefile config.status: creating examples/python/tinybasic/Makefile config.status: creating examples/python/tinyc/Makefile config.status: creating examples/python/transform/Makefile config.status: creating examples/python/treewalk/Makefile config.status: creating examples/python/unicode/Makefile config.status: creating examples/python/unicode.IDENTs/Makefile config.status: creating examples/python/xml/Makefile config.status: creating scripts/csc.sh config.status: creating lib/csharp/Makefile config.status: creating lib/csharp/src/Makefile config.status: error: cannot find input file: lib/csharp/src/Makefile.in

Error: /opt/local/bin/port: Status 1 encountered during processing.