The build is unreachable.
Build log
> /tmp/stackage-build2452$ stack unpack htaglib-1.2.0@sha256:d9765512fa58e8e2af54ecd5fc11278a559c10dc6e0864b3fc6502ab3089f6c6
Unpacked htaglib-1.2.0 to /tmp/stackage-build2452/htaglib-1.2.0/
> /tmp/stackage-build2452/htaglib-1.2.0$ 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/htaglib-1.2.0$ ./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/htaglib-1.2.0 --htmldir=/home/circleci/project/builds/nightly/doc/htaglib-1.2.0 --haddockdir=/home/circleci/project/builds/nightly/doc/htaglib-1.2.0
Configuring htaglib-1.2.0...
> /tmp/stackage-build2452/htaglib-1.2.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/htaglib-1.2.0$ ./Setup build
Preprocessing library for htaglib-1.2.0..
Building library for htaglib-1.2.0..
[1 of 5] Compiling Sound.HTagLib.Type ( Sound/HTagLib/Type.hs, dist/build/Sound/HTagLib/Type.o )
[2 of 5] Compiling Sound.HTagLib.Internal ( Sound/HTagLib/Internal.hs, dist/build/Sound/HTagLib/Internal.o )
[3 of 5] Compiling Sound.HTagLib.Setter ( Sound/HTagLib/Setter.hs, dist/build/Sound/HTagLib/Setter.o )
[4 of 5] Compiling Sound.HTagLib.Getter ( Sound/HTagLib/Getter.hs, dist/build/Sound/HTagLib/Getter.o )
[5 of 5] Compiling Sound.HTagLib ( Sound/HTagLib.hs, dist/build/Sound/HTagLib.o )
> /tmp/stackage-build2452/htaglib-1.2.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/htaglib-1.2.0$ ./Setup copy
Installing library in /home/circleci/project/builds/nightly/lib/x86_64-linux-ghc-8.7.20181119/htaglib-1.2.0-EdDz7Ui13CP8TpEk5bnotX
> /tmp/stackage-build2452/htaglib-1.2.0$ ghc -clear-package-db -global-package-db -package-db=/home/circleci/project/builds/nightly/pkgdb Setup
> /tmp/stackage-build2452/htaglib-1.2.0$ ./Setup register
Registering library for htaglib-1.2.0..