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...
cabal: Could not resolve dependencies:
[__0] trying: math-grads-0.1.6.7 (user goal)
[__1] trying: vector-0.12.1.2 (dependency of math-grads)
[__2] next goal: deepseq (dependency of vector)
[__2] rejecting: deepseq-1.4.4.0/installed-1.4... (conflict: math-grads =>
array>=0.5.4.0 && <0.6, deepseq => array==0.5.3.0/installed-0.5...)
[__2] trying: deepseq-1.4.4.0
[__3] next goal: linear (dependency of math-grads)
[__3] rejecting: linear-1.21 (conflict: math-grads => linear>=1.20.9 && <1.21)
[__3] trying: linear-1.20.9
[__4] trying: linear:+template-haskell
[__5] trying: template-haskell-2.14.0.0/installed-2.1... (dependency of linear
+template-haskell)
[__6] next goal: pretty (dependency of template-haskell)
[__6] rejecting: pretty-1.1.3.6/installed-1.1... (conflict: deepseq==1.4.4.0,
pretty => deepseq==1.4.4.0/installed-1.4...)
[__6] rejecting: pretty-1.1.3.6, pretty-1.1.3.5, pretty-1.1.3.4,
pretty-1.1.3.3, pretty-1.1.3.2, pretty-1.1.3.1, pretty-1.1.2.1,
pretty-1.1.2.0, pretty-1.1.1.3, pretty-1.1.1.2, pretty-1.1.1.1,
pretty-1.1.1.0, pretty-1.1.0.0, pretty-1.0.1.2, pretty-1.0.1.1,
pretty-1.0.1.0, pretty-1.0.0.0 (conflict: template-haskell =>
pretty==1.1.3.6/installed-1.1...)
[__6] fail (backjumping, conflict set: deepseq, pretty, template-haskell)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: math-grads, linear, template-haskell,
pretty, vector, base, linear:template-haskell, deepseq