Problem compiling haskell-regex-posix-0.93.2-4 (from sid) with haskell-devscripts-0.7.2 (from sid) and ghc 6.13-20091231

[David Fox <ddssff@gmail.com>]

I know nobody else is using this compiler, but I suspect the issue is
in haskell-devscripts as the error occurs after the compile.  It is
quite odd, because there doesn't seem to be anything at all unusual
about the regex-posix package.  Every other package I have tried
builds fine (except for those that depend on this one.)  The compiler
is built using the packaging for 6.12.1-9 with a tweak to get the
quilt patches to apply.  Here is the error, which occurs after the doc
deb is created, while the dev deb is being created.  Any ideas what is
going wrong?

dh_installdirs -plibghc6-regex-posix-dev
install: target
`../libghc6-regex-posix-dev/usr/lib/haskell-packages/ghc6/lib/' is not
a directory: No such file or directory
install: omitting directory
`usr/lib/haskell-packages/ghc6/lib/regex-posix-0.93.2'
install: omitting directory
`usr/lib/haskell-packages/ghc6/lib/regex-posix-0.93.2/ghc-6.13'
install: omitting directory
`usr/lib/haskell-packages/ghc6/lib/regex-posix-0.93.2/ghc-6.13/Text'
install: omitting directory
`usr/lib/haskell-packages/ghc6/lib/regex-posix-0.93.2/ghc-6.13/Text/Regex'
install: omitting directory
`usr/lib/haskell-packages/ghc6/lib/regex-posix-0.93.2/ghc-6.13/Text/Regex/Posix'
install: omitting directory
`usr/lib/haskell-packages/ghc6/lib/regex-posix-0.93.2/ghc-6.13/Text/Regex/Posix/ByteString'
cd debian/tmp-inst-ghc6 ; find usr/lib/haskell-packages/ghc6/lib/ \
                \( ! -name "*_p.a" ! -name "*.p_hi" \) \
                -exec install -Dm 644 '{}' ../libghc6-regex-posix-dev/'{}' ';'
pkg_config=`debian/hlibrary.setup register --builddir=dist-ghc6
--gen-pkg-config | sed -r 's,.*: ,,'`; \
                install -Dm 644 $pkg_config
debian/libghc6-regex-posix-dev/var/lib/ghc-6.13/package.conf.d/$pkg_config;
\
                rm -f $pkg_config
install: target `regex-posix-0.93.2.conf' is not a directory
mkdir -p debian/libghc6-regex-posix-dev//usr/lib/ghc-6.13/haddock/regex-posix-0.93.2/
[ 0 = `ls debian/tmp-inst-ghc6//usr/lib/ghc-6.13/haddock/regex-posix-0.93.2//
2>/dev/null | wc -l` ] || \
                cp -r
debian/tmp-inst-ghc6//usr/lib/ghc-6.13/haddock/regex-posix-0.93.2//*.haddock
\

debian/libghc6-regex-posix-dev//usr/lib/ghc-6.13/haddock/regex-posix-0.93.2/