Resolving dependencies... cabal: Could not resolve dependencies: trying: base-4.9.0.0/installed-4.9... (dependency of computational-algebra-0.0.3.2) trying: peggy-0.3.2 (dependency of computational-algebra-0.0.3.2) trying: haskell-src-meta-0.7.0 (dependency of peggy-0.3.2) next goal: template-haskell (dependency of peggy-0.3.2) rejecting: template-haskell-2.11.0.0/installed-2.1..., template-haskell-2.11.0.0, template-haskell-2.10.0.0, template-haskell-2.9.0.0 (conflict: peggy => template-haskell>=2.5 && <2.9) rejecting: template-haskell-2.8.0.0 (conflict: base==4.9.0.0/installed-4.9..., template-haskell => base==4.6.*) rejecting: template-haskell-2.7.0.0 (conflict: base==4.9.0.0/installed-4.9..., template-haskell => base==4.5.*) rejecting: template-haskell-2.6.0.0, template-haskell-2.5.0.0 (conflict: haskell-src-meta => template-haskell>=2.7 && <2.12) rejecting: template-haskell-2.4.0.1, template-haskell-2.4.0.0, template-haskell-2.3.0.1, template-haskell-2.3.0.0, template-haskell-2.2.0.0 (conflict: peggy => template-haskell>=2.5 && <2.9) Dependency tree exhaustively searched.