After today I get my version of zeos 6.6.6 stable and change any files and compiled with lazarus 0.9.34 with fpc 2.6.0.
In unit ZClasses that had problem with method
function QueryInterface(const iid : tguid;out obj)...
replace part by
function QueryInterface({$IFDEF FPC_HAS_CONSTREF}constref{$ELSE}const{$ENDIF} iid : tguid;out obj)...
and this part compiled. After arrange show me the error in ZabstractRODataSet this was remove the directive with FPC2_1UP in const BaseFieldTypes.
And now all compilled ok with fpc 2.60 and lazarus 0.9.34
Have a good day