dont initialize yylineno in case the lex variant defines it separately (as

    flex does)

lex.l

@@ -13,7 +13,7 @@
 #include "gram.h"
 #include "constants.h"
 #if defined(FLEX_SCANNER) && !defined(YY_FLEX_LEX_COMPAT) && !defined(__UNIXOS2__)
-int yylineno = 0;
+int yylineno;
 #endif
 %}