add initial solution to day 4

1 files changed, 6 insertions, 0 deletions

diff --git a/aoc.cabal b/aoc.cabal
index e88e933..dda4a43 100644
--- a/aoc.cabal
+++ b/aoc.cabal
@@ -30,6 +30,12 @@ executable Day02
 
 executable Day03
   main-is:             Day03.hs
+  build-depends:       base
+  default-language:    Haskell2010
+  hs-source-dirs:      execs
+
+executable Day04
+  main-is:             Day04.hs
   build-depends:       base, parsec
   default-language:    Haskell2010
   hs-source-dirs:      execs