Resolving dependencies... Configuring colour-2.3.4... Configuring transformers-0.5.5.0... Building colour-2.3.4... Building transformers-0.5.5.0... Installed colour-2.3.4 Configuring ansi-terminal-0.8.0.2... Building ansi-terminal-0.8.0.2... Installed ansi-terminal-0.8.0.2 Configuring ansi-wl-pprint-0.6.8.2... Installed transformers-0.5.5.0 Configuring transformers-compat-0.6.1.6... Building ansi-wl-pprint-0.6.8.2... Building transformers-compat-0.6.1.6... Installed ansi-wl-pprint-0.6.8.2 Installed transformers-compat-0.6.1.6 Configuring optparse-applicative-0.14.2.0... Building optparse-applicative-0.14.2.0... Installed optparse-applicative-0.14.2.0 Configuring cdeps-0.1.0.0... Building cdeps-0.1.0.0... Failed to install cdeps-0.1.0.0 Build log ( /home/builder/.cabal/logs/ghc-8.2.2/cdeps-0.1.0.0-GqsfC0vVbdyFuPBfQgorAB.log ): cabal: Entering directory '/tmp/cabal-tmp-19997/cdeps-0.1.0.0' Configuring cdeps-0.1.0.0... Preprocessing library for cdeps-0.1.0.0.. Building library for cdeps-0.1.0.0.. [1 of 1] Compiling Language.C.Dependency ( dist/build/Language/C/Dependency.hs, dist/build/Language/C/Dependency.o ) src/Language/C/Dependency.x:124:31: error: • Variable not in scope: (<>) :: [FilePath] -> [String] -> t • Perhaps you meant one of these: ‘<*>’ (imported from Control.Applicative), ‘>>’ (imported from Control.Monad), ‘<$>’ (imported from Prelude) | 124 | allDirs = dir : incls <> split envPath | ^^ src/Language/C/Dependency.x:125:28: error: • Variable not in scope: (<>) :: a0 -> FilePath -> FilePath • Perhaps you meant one of these: ‘<*>’ (imported from Control.Applicative), ‘>>’ (imported from Control.Monad), ‘<$>’ (imported from Prelude) | 125 | filterM doesFileExist ((<>) <$> allDirs <*> incl) | ^^^^ cabal: Leaving directory '/tmp/cabal-tmp-19997/cdeps-0.1.0.0' cabal: Error: some packages failed to install: cdeps-0.1.0.0-GqsfC0vVbdyFuPBfQgorAB failed during the building phase. The exception was: ExitFailure 1