The build is unreachable.

Build log

> /tmp/stackage-build2451$ stack unpack unix-time-0.3.8@sha256:32d5caa6e7a72600e4e3c94026c297634c31ec6e82b0aeed00b915e61fab3b2f
Unpacked unix-time-0.3.8 to /tmp/stackage-build2451/unix-time-0.3.8/
> /tmp/stackage-build2451/unix-time-0.3.8$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
[1 of 1] Compiling Main             ( Setup.hs, Setup.o )
Linking Setup ...
> /tmp/stackage-build2451/unix-time-0.3.8$ ./Setup configure --package-db=clear --package-db=global --package-db=/home/circleci/project/builds/nightly/pkgdb --libdir=/home/circleci/project/builds/nightly/lib --bindir=/home/circleci/project/builds/nightly/bin --datadir=/home/circleci/project/builds/nightly/share --libexecdir=/home/circleci/project/builds/nightly/libexec --sysconfdir=/home/circleci/project/builds/nightly/etc --docdir=/home/circleci/project/builds/nightly/doc/unix-time-0.3.8 --htmldir=/home/circleci/project/builds/nightly/doc/unix-time-0.3.8 --haddockdir=/home/circleci/project/builds/nightly/doc/unix-time-0.3.8
Configuring unix-time-0.3.8...
checking for gcc... /usr/bin/gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /usr/bin/gcc accepts -g... yes
checking for /usr/bin/gcc option to accept ISO C89... none needed
checking how to run the C preprocessor... /usr/bin/gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking xlocale.h usability... yes
checking xlocale.h presence... yes
checking for xlocale.h... yes
checking for strptime_l... yes
checking for timegm... yes
configure: creating ./config.status
config.status: creating cbits/config.h
> /tmp/stackage-build2451/unix-time-0.3.8$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/unix-time-0.3.8$ ./Setup build
Preprocessing library for unix-time-0.3.8..
Building library for unix-time-0.3.8..
[1 of 5] Compiling Data.UnixTime.Types ( dist/build/Data/UnixTime/Types.hs, dist/build/Data/UnixTime/Types.o )
[2 of 5] Compiling Data.UnixTime.Sys ( dist/build/Data/UnixTime/Sys.hs, dist/build/Data/UnixTime/Sys.o )
[3 of 5] Compiling Data.UnixTime.Diff ( Data/UnixTime/Diff.hs, dist/build/Data/UnixTime/Diff.o )
[4 of 5] Compiling Data.UnixTime.Conv ( Data/UnixTime/Conv.hs, dist/build/Data/UnixTime/Conv.o )

Data/UnixTime/Conv.hs:11:1: warning: [-Wunused-imports]
    The import of ‘Control.Applicative’ is redundant
      except perhaps to import instances from ‘Control.Applicative’
    To import instances alone, use: import Control.Applicative()
   |
11 | import Control.Applicative
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[5 of 5] Compiling Data.UnixTime    ( Data/UnixTime.hs, dist/build/Data/UnixTime.o )
> /tmp/stackage-build2451/unix-time-0.3.8$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/unix-time-0.3.8$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/unix-time-0.3.8-FjsUJNFILJ4DSNs3mxbHHh
> /tmp/stackage-build2451/unix-time-0.3.8$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2451/unix-time-0.3.8$ ./Setup register
Registering library for unix-time-0.3.8..