Add llvm-hs-pure dependency

.gitignore

@@ -0,0 +1,23 @@
+dist
+dist-*
+cabal-dev
+*.o
+*.hi
+*.hie
+*.chi
+*.chs.h
+*.dyn_o
+*.dyn_hi
+.hpc
+.hsenv
+.cabal-sandbox/
+cabal.sandbox.config
+*.prof
+*.aux
+*.hp
+*.eventlog
+.stack-work/
+cabal.project.local
+cabal.project.local~
+.HTF/
+.ghc.environment.*

windows12.cabal

@@ -69,7 +69,10 @@ executable windows12
     -- other-extensions:
 
     -- Other library packages from which modules are imported.
-    build-depends:    base ^>=4.18.2.1
+    build-depends:
+        base >= 4.15.1 && < 4.16,
+        llvm-hs-pure >= 9.0.0 && < 9.1,
+
 
     -- Directories containing source files.
     hs-source-dirs:   src