Build error: No (or multiple) ghc rts package is registered

[Roman Cheplyaka]

Hi,

I tried to build GHC HEAD today, but eventually got this error:

  ghc-cabal: No (or multiple) ghc rts package is registered!!
  make[1]: *** [libraries/ghc-prim/dist-install/package-data.mk] Error 1
  make: *** [all] Error 2

I did "make clean" before starting the build — is it not sufficient?

Roman
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