circular unit dependency

["R" <ruthless@poczta.onet.pl>]

Hello everybody.

I've got a problem with circular unit dependency.

In main package I have:

with base;
with base.derv1;
with base.derv2;

derv1 has tagged record rec1 and derv2 has its rec2

the derv1 and derv2 packages have overritten operator "+"
which spec look like this:

in derv1 package spec and body I have:

with base.derv2; -- info about rec2 needed in "+" spec
...
function "+"(left: rec1; right: base.derv2.rec2) return rec1;

and the same thing with the second package spec and body:

with base.derv1; -- info about rec1 needed in "+"'s spec
...
function "+"(left: rec2; right: base.derv1.rec1) return rec2;

when I compile it with gcc i have:
main.adb:8:06: circular unit dependency
main.adb:8:06: "Main (body)" depends on "base.derv1 (spec)"
main.adb:8:06: "base.derv1 (spec)" depends on "base.derv2 (spec)"
main.adb:8:06: "base.derv2 (spec)" depends on "base.derv1 (spec)"
main.adb:8:06: "base.derv1 (spec)" depends on "base.derv1 (body)"
main.adb:8:06: "base.derv1 (body)" depends on "base.derv1 (spec)"
main.adb:8:06: "base.derv1 (spec)" depends on "base.derv1 (spec)"

well - I need info about other record because it's the parameter of
both function"+"

any idea? I tried to remove 'with' statement but then I received  msgs
like:
"xxx" not declared in "yyy"

thanks in advance

best regards
R