IdeIntf package was refactored, non-GUI parts were moved to a new BuildIntf package.
Commit r62795 by Mattias (although I did the actual split).

Rebuilding the sources after r62795 using a Lazarus executable built before it gives an error. The old IDE does not know where the BuildInf package is. The easiest cure is to open components/buildide.lpk in the IDE. Building succeeds once the IDE has seen it.
See issue :
https://bugs.freepascal.org/view.php?id=36819

Juha
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AM Juha Manninen wrote

The easiest cure is to open components/buildide.lpk in the IDE.

Oops :(
It should be "components/buildintf/buildintf.lpk" obviously. -------------- next part --------------
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