I started an OpenGL project within an LTS sandbox as guided on another post and, somewhat foolishly it would see, I did a "cabal install cabal-install" when prompted that a new version was available. The very next time I tried to work on my code.... I got this: bash-3.2$ pwd /Users/seancharles/Documents/Coding/haskell/lts1 bash-3.2$ cabal build cabal: You need to re-run the 'configure' command. The version of Cabal being used has changed (was Cabal-1.20.0.1, now Cabal-1.16.0). bash-3.2$ cabal configure Resolving dependencies... Configuring lts1-0.1.0.0... cabal: At least the following dependencies are missing: base ==4.7.* bash-3.2$ cabal build cabal: You need to re-run the 'configure' command. The version of Cabal being used has changed (was Cabal-1.20.0.1, now Cabal-1.16.0). bash-3.2$ ls -l total 112 -rw-r--r-- 1 seancharles staff 19 Mar 2 12:53 LICENCSE -rw-r--r-- 1 seancharles staff 552 Mar 3 20:09 Main.hs -rw-r--r-- 1 seancharles staff 477 Mar 3 20:07 Main.hs~ -rw-r--r-- 1 seancharles staff 46 Mar 2 12:52 Setup.hs -rw-r--r-- 1 seancharles staff 30198 Mar 2 12:51 cabal.config -rw-r--r-- 1 seancharles staff 1090 Mar 2 12:51 cabal.sandbox.config drwxr-xr-x 5 seancharles staff 170 Mar 2 12:53 dist -rw-r--r-- 1 seancharles staff 1932 Mar 2 12:52 lts1.cabal bash-3.2$ So, welcome to a different kind of hell, "cabal version hell" perhaps? Can anybody help me get it running again? Thanks. Sean.