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     data-default-class-0.1.2.0
Starting     dlist-0.8.0.7
Starting     old-locale-1.0.0.7
Starting     primitive-0.7.0.0
Building     data-default-class-0.1.2.0
Building     old-locale-1.0.0.7
Building     dlist-0.8.0.7
Building     primitive-0.7.0.0
Completed    old-locale-1.0.0.7
Completed    data-default-class-0.1.2.0
Starting     data-default-instances-containers-0.0.1
Starting     data-default-instances-old-locale-0.0.1
Building     data-default-instances-old-locale-0.0.1
Building     data-default-instances-containers-0.0.1
Completed    dlist-0.8.0.7
Starting     data-default-instances-dlist-0.0.1
Building     data-default-instances-dlist-0.0.1
Completed    data-default-instances-old-locale-0.0.1
Completed    data-default-instances-containers-0.0.1
Completed    data-default-instances-dlist-0.0.1
Starting     data-default-0.7.1.1
Building     data-default-0.7.1.1
Completed    data-default-0.7.1.1
Completed    primitive-0.7.0.0
Starting     vector-0.12.0.3
Building     vector-0.12.0.3
Completed    vector-0.12.0.3
Starting     libmodbus-1.0.0
Failed to install libmodbus-1.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.6.3/libmodbus-1.0.0-CURc6kHhxE89ktScLbOPUE.log ):
cabal: Entering directory '/tmp/cabal-tmp-3658/libmodbus-1.0.0'
Configuring libmodbus-1.0.0...
cabal: Missing dependency on a foreign library:
* Missing (or bad) C library: modbus
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.

cabal: Leaving directory '/tmp/cabal-tmp-3658/libmodbus-1.0.0'
cabal: Error: some packages failed to install:
libmodbus-1.0.0-CURc6kHhxE89ktScLbOPUE failed during the configure step. The
exception was:
ExitFailure 1