The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack clock-0.7.2@sha256:c5c2514aead260101c7528d10bf0f41d9d1d7b919136e2dff77a57ec16740bd2
Unpacked clock-0.7.2 to /tmp/stackage-build2452/clock-0.7.2/
> /tmp/stackage-build2452/clock-0.7.2$ 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-build2452/clock-0.7.2$ ./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/clock-0.7.2 --htmldir=/home/circleci/project/builds/nightly/doc/clock-0.7.2 --haddockdir=/home/circleci/project/builds/nightly/doc/clock-0.7.2
Configuring clock-0.7.2...
> /tmp/stackage-build2452/clock-0.7.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/clock-0.7.2$ ./Setup build
Preprocessing library for clock-0.7.2..
Clock.hsc:44:0: warning: "hsc_alignment" redefined
In file included from dist/build/System/Clock_hsc_make.c:1:0:
/home/circleci/ghc-head/lib/ghc-8.7.20181119/template-hsc.h:91:0: note: this is the location of the previous definition
 #define hsc_alignment(x...)                                           \
 ^
Building library for clock-0.7.2..
[1 of 1] Compiling System.Clock     ( dist/build/System/Clock.hs, dist/build/System/Clock.o )
> /tmp/stackage-build2452/clock-0.7.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/clock-0.7.2$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/clock-0.7.2-6GYCAXixqb8FuS0ooeoDbD
> /tmp/stackage-build2452/clock-0.7.2$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/clock-0.7.2$ ./Setup register
Registering library for clock-0.7.2..