For discussion for now.

The graphviz dependency is repeatedly problematic when trying to update to a new
GHC so having a quick way to defer dealing with it for a while will be helpful.

An alternative approach would simply be to drop "darcs show dependencies",
or just inline the bits of graphviz we need.

1 patch for repository darcs-unstable@darcs.net:screened:

patch 2c8715c83912daa42441e146b4c18f004b237319
Author: Ganesh Sittampalam <ganesh@earth.li>
Date:   Sat Jan 25 15:55:25 GMT 2020
  * option to disable graphviz

Attachments

• option-to-disable-graphviz.dpatch
• patch-preview.txt
• unnamed

I am fine with that. Attached is an amended version to restore the
dependency if the flag is set.

1 patch for repository http://darcs.net/screened:

patch 3e74f3e663c355b3e314b3bea6e7eee02b1012cf
Author: Ganesh Sittampalam <ganesh@earth.li>
Date:   Mon Jan 27 14:00:55 CET 2020
  * option to disable graphviz

Attachments

• option-to-disable-graphviz_0.dpatch
• patch-preview.txt
• unnamed

Yet another amend: I didn't realize that the #define of HAVE_GRAPHVIZ is not
automatically done by cabal but must be done manually with a cpp-options
field.

1 patch for repository http://darcs.net/screened:

patch df9802529bf5fd188082d03103116ec8f7c7ee64
Author: Ganesh Sittampalam <ganesh@earth.li>
Date:   Mon Jan 27 14:27:36 CET 2020
  * option to disable graphviz

Attachments

• option-to-disable-graphviz.dpatch
• patch-preview.txt
• unnamed

Screening my latest version now.

Thanks! From what I remember I did get it right initially, but
I must have screwed up when resolving some conflicts.

Looks fine (and is irrelevant given patch1969 anyway)