The build is unreachable.

Build log

> /tmp/stackage-build2452$ stack unpack iproute-1.7.6@sha256:c0ad3adc3b5b061c8b73a36e2ffe4ae2565fc539a293ace9087f0fae780fe2e7
Unpacked iproute-1.7.6 to /tmp/stackage-build2452/iproute-1.7.6/
> /tmp/stackage-build2452/iproute-1.7.6$ 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/iproute-1.7.6$ ./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/iproute-1.7.6 --htmldir=/home/circleci/project/builds/nightly/doc/iproute-1.7.6 --haddockdir=/home/circleci/project/builds/nightly/doc/iproute-1.7.6
Configuring iproute-1.7.6...
> /tmp/stackage-build2452/iproute-1.7.6$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/iproute-1.7.6$ ./Setup build
Preprocessing library for iproute-1.7.6..
Building library for iproute-1.7.6..
[1 of 8] Compiling Data.IP.Addr     ( Data/IP/Addr.hs, dist/build/Data/IP/Addr.o )
[2 of 8] Compiling Data.IP.Mask     ( Data/IP/Mask.hs, dist/build/Data/IP/Mask.o )
[3 of 8] Compiling Data.IP.Range    ( Data/IP/Range.hs, dist/build/Data/IP/Range.o )
[4 of 8] Compiling Data.IP.Op       ( Data/IP/Op.hs, dist/build/Data/IP/Op.o )
[5 of 8] Compiling Data.IP.Internal ( Data/IP/Internal.hs, dist/build/Data/IP/Internal.o )
[6 of 8] Compiling Data.IP          ( Data/IP.hs, dist/build/Data/IP.o )
[7 of 8] Compiling Data.IP.RouteTable.Internal ( Data/IP/RouteTable/Internal.hs, dist/build/Data/IP/RouteTable/Internal.o )
[8 of 8] Compiling Data.IP.RouteTable ( Data/IP/RouteTable.hs, dist/build/Data/IP/RouteTable.o )
> /tmp/stackage-build2452/iproute-1.7.6$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/iproute-1.7.6$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/iproute-1.7.6-Wp0rw8lvT4CO7zaw8Xndf
> /tmp/stackage-build2452/iproute-1.7.6$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/iproute-1.7.6$ ./Setup register
Registering library for iproute-1.7.6..