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 network-3.0.0.0 Building network-3.0.0.0 Completed network-3.0.0.0 Downloading HsOpenSSL-0.11.4.16 Downloaded HsOpenSSL-0.11.4.16 Starting HsOpenSSL-0.11.4.16 Failed to install HsOpenSSL-0.11.4.16 Build log ( /home/builder/.cabal/logs/ghc-8.6.3/HsOpenSSL-0.11.4.16-9J33KophY81D8b69rRwa66.log ): cabal: Entering directory '/tmp/cabal-tmp-29132/HsOpenSSL-0.11.4.16' [1 of 1] Compiling Main ( /tmp/cabal-tmp-29132/HsOpenSSL-0.11.4.16/dist/setup/setup.hs, /tmp/cabal-tmp-29132/HsOpenSSL-0.11.4.16/dist/setup/Main.o ) Linking /tmp/cabal-tmp-29132/HsOpenSSL-0.11.4.16/dist/setup/setup ... Configuring HsOpenSSL-0.11.4.16... setup: Missing dependencies on foreign libraries: * Missing (or bad) header file: openssl/asn1.h * Missing (or bad) C libraries: ssl, crypto This problem can usually be solved by installing the system packages that provide these libraries (you may need the "-dev" versions). If the libraries are already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are.If the library files do 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-29132/HsOpenSSL-0.11.4.16' cabal: Error: some packages failed to install: HsOpenSSL-0.11.4.16-9J33KophY81D8b69rRwa66 failed during the configure step. The exception was: ExitFailure 1