--  While building custom Setup.hs for package digest-0.0.1.2 using:
      /home/sam/.stack/setup-exe-cache/x86_64-linux/Cabal-simple_mPHDZzAJ_2.0.1.0_ghc-8.2.2 --builddir=.stack-work/dist/x86_64-linux/Cabal-2.0.1.0 configure --with-ghc=/home/sam/.nix-profile/bin/ghc --with-ghc-pkg=/home/sam/.nix-profile/bin/ghc-pkg --user --package-db=clear --package-db=global --package-db=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/pkgdb --libdir=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/lib --bindir=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/bin --datadir=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/share --libexecdir=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/libexec --sysconfdir=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/etc --docdir=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/doc/digest-0.0.1.2 --htmldir=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/doc/digest-0.0.1.2 --haddockdir=/home/sam/.stack/snapshots/x86_64-linux/lts-11.6/8.2.2/doc/digest-0.0.1.2 --dependency=base=base-4.10.1.0 --dependency=bytestring=bytestring-0.10.8.2
    Process exited with code: ExitFailure 1
    Logs have been written to: /tmp/stack-upgrade4002/stack-1.7.1/.stack-work/logs/digest-0.0.1.2.log
    Configuring digest-0.0.1.2...
    Cabal-simple_mPHDZzAJ_2.0.1.0_ghc-8.2.2: Missing dependency on a foreign
    library:
    * Missing (or bad) header file: zlib.h
    * Missing C library: z
    This problem can usually be solved by installing the system package that
    provides this library (you may need the "-dev" version). If the library is
    already installed but in a non-standard location then you can use the flags
    --extra-include-dirs= and --extra-lib-dirs= to specify where it is.
    If the header file does exist, it may contain errors that are caught by the C
    compiler at the preprocessing stage. In this case you can re-run configure
    with the verbosity flag -v3 to see the error messages.