[stefanov@nixos:~/ariadne]$ stack build --nix
Preparing to install GHC to an isolated location.
This will not interfere with any system-level installation.
Already downloaded.
Running /home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2.temp/ghc-8.2.2/configure --prefix=/home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2/ in directory /home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2.temp/ghc-8.2.2/ exited with ExitFailure 1

checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
Build platform inferred as: x86_64-unknown-linux
Host platform inferred as: x86_64-unknown-linux
Target platform inferred as: x86_64-unknown-linux
GHC build  : x86_64-unknown-linux
GHC host   : x86_64-unknown-linux
GHC target : x86_64-unknown-linux
checking for path to top of build tree... /home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2.temp/ghc-8.2.2
checking for perl... no
You must install perl before you can continue
Perhaps it is already installed, but not in your PATH?



Error: Error encountered while configuring GHC with
         /home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2.temp/ghc-8.2.2/configure --prefix=/home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2/
         run in /home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2.temp/ghc-8.2.2/

       The following directories may now contain files, but won't be used by stack:
         - /home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2.temp/
         - /home/stefanov/.stack/programs/x86_64-linux-nix/ghc-8.2.2/

Configuring GHC ...