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* data/c.m4 (b4_api_prefix, b4_api_PREFIX): New. (b4_prefix, b4_union_name, b4_token_enums, b4_declare_yylstype): Use them. * data/glr.c, data/yacc.c, data/glr.cc, data/lalr1.cc: Use them to change the prefix of exported preprocessor symbols. * src/getargs.c (usage): Ditto. * tests/headers.at (Several parsers): New. * tests/local.at (AT_API_PREFIX): New. AT_YYSTYPE, AT_YYLTYPE): Adjust. * doc/bison.texi (Multiple Parsers): Move documentation of %name-prefix to... (Table of Symbols): here. (Multiple Parsers): Document api.prefix. (%define Summary): Point to it. Use @code for variable names. (Bison Options): -p/--name-prefix are obsoleted. * NEWS: Announce api.prefix.