pandoc @1.12.2.1_7 won't install

[fhgwright (Fred Wright)]

Recent "upgrade outdated" attempts are unable to update pandoc. Uninstalling/reinstalling doesn't help. I believe this is related to the recent updates to ghc and friends (which also triggered a huge raft of warnings about failures of deactivate scripts, though I think those have been fixed now).

The relevant excerpt from the log (with added blank lines for formatting) is here:

:info:configure Configuring pandoc-1.12.2.1...
:info:configure Setup: At least the following dependencies are missing:
:info:configure array >=0.3 && <0.5,
:info:configure blaze-html >=0.5 && <0.7,
:info:configure blaze-markup >=0.5.1 && <0.6,
:info:configure process >=1 && <1.2,
:info:configure temporary ==1.1.*,
:info:configure text ==0.11.*
:info:configure Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_pandoc/pandoc/work/pandoc-1.12.2.1" && runhaskell Setup configure --prefix=/opt/local --with-compiler=/opt/local/bin/ghc -v --enable-library-profiling --with-gcc=/usr/bin/clang 
:info:configure Exit code: 1

I'm also attaching the full log.

[fhgwright (Fred Wright)]

Log from install failure.

[ryandesign (Ryan Carsten Schmidt)]

I think this is a duplicate of #42082. See also #43532.

For better formatting, see WikiFormatting.