Recover Firebird driver
/usr/local/bin/gprbuild -p -j1 -Pgnat/matreshka_sql_firebird.gpr
object directory "/wrkdirs/devel/matreshka/work/matreshka-0.6.0/gnat/../.objs/sql/firebird/" created
ada -c -fPIC -g -gnatwa -gnat12 -gnatW8 -march=i686 -O2 -gnatn matreshka-internals-sql_drivers-firebird-queries.adb
matreshka-internals-sql_drivers-firebird-queries.adb:298:31: expected an access type with designated type "Abstract_Query'Class" defined at matreshka-internals-sql_drivers.ads:69
matreshka-internals-sql_drivers-firebird-queries.adb:298:31: found an access type with designated type "Firebird_Query'Class" defined at matreshka-internals-sql_drivers-firebird-queries.ads:53
matreshka-internals-sql_drivers-firebird-queries.ads:72:09: type must be declared abstract or "Is_Valid" overridden
matreshka-internals-sql_drivers-firebird-queries.ads:72:09: "Is_Valid" has been inherited at line 53
matreshka-internals-sql_drivers-firebird-queries.ads:72:09: "Is_Valid" has been inherited from subprogram at matreshka-internals-sql_drivers.ads:157
matreshka-internals-sql_drivers-firebird-databases.ads:80:09: type must be declared abstract or "Open" overridden
matreshka-internals-sql_drivers-firebird-databases.ads:80:09: "Open" has been inherited at line 57
matreshka-internals-sql_drivers-firebird-databases.ads:80:09: "Open" has been inherited from subprogram at matreshka-internals-sql_drivers.ads:81
matreshka-internals-sql_drivers-firebird-databases.ads:107:15: subprogram "Open" is not overriding
gprbuild: *** compilation phase failed
gmake[1]: *** [firebird] Error 4
gmake[1]: Leaving directory `/wrkdirs/devel/matreshka/work/matreshka-0.6.0'
gmake: *** [all] Error 2
*** Error code 1
In 4465: