Only declare yylineno in "older" versions of flex.  Flex 2.5.31 declares it (and so compiling using that version failed).  Flex 2.5.4a does not define YY_FLEX_SUBMINOR_VERSION, whereas 2.5.31 does define it (as 31).
Only declare yylineno in "older" versions of flex.  Flex 2.5.31
declares it (and so compiling using that version failed).  Flex 2.5.4a
does not define YY_FLEX_SUBMINOR_VERSION, whereas 2.5.31 does define
it (as 31).

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb