Warning: The install command is a part of the legacy v1 style of cabal usage.

Please switch to using either the new project style and the new-install
command or the legacy v1-install alias as new-style projects will become the
default in the next version of cabal-install. Please file a bug if you cannot
replicate a working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
Starting     hopenssl-2.2.4
Starting     old-locale-1.0.0.7
Starting     hsyslog-5.0.2
Starting     network-2.8.0.0
Building     old-locale-1.0.0.7
Building     hsyslog-5.0.2
Building     hopenssl-2.2.4
Completed    old-locale-1.0.0.7
Starting     old-time-1.1.0.3
Completed    hopenssl-2.2.4
Completed    hsyslog-5.0.2
Building     network-2.8.0.0
Building     old-time-1.1.0.3
Completed    old-time-1.1.0.3
Starting     hsemail-2
Building     hsemail-2
Completed    network-2.8.0.0
Starting     hsdns-1.8
Failed to install hsdns-1.8
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/hsdns-1.8-9qbfM1saFtcLCG8A565jjI.log ):
cabal: Entering directory '/tmp/cabal-tmp-26365/hsdns-1.8'
Configuring hsdns-1.8...
cabal: Missing dependency on a foreign library:
* Missing (or bad) header file: adns.h
* Missing (or bad) C library: adns
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
library 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.
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.

cabal: Leaving directory '/tmp/cabal-tmp-26365/hsdns-1.8'
Completed    hsemail-2
cabal: Error: some packages failed to install:
hsdns-1.8-9qbfM1saFtcLCG8A565jjI failed during the configure step. The
exception was:
ExitFailure 1
postmaster-0.3.3-Eae1dFjixjvBPgBdeuox2B depends on postmaster-0.3.3 which
failed to install.