lied about it building purely

README.md

@@ -14,6 +14,10 @@ Nix can be installed with:
 curl https://nixos.org/nix/install | sh
 ```  
 
+### Dependencies
+
+`imagemagick` is required for the favicons.
+
 ### Installing
 
 Enter the build environment

default.nix

@@ -1,4 +1,6 @@
-{ mkDerivation, base, filepath, hakyll, hakyll-favicon, stdenv }:
+{ mkDerivation, base, filepath, hakyll, hakyll-favicon, imagemagick
+, stdenv
+}:
 mkDerivation {
   pname = "rf";
   version = "0.1.2.0";
@@ -6,6 +8,7 @@ mkDerivation {
   isLibrary = false;
   isExecutable = true;
   executableHaskellDepends = [ base filepath hakyll hakyll-favicon ];
+  executableSystemDepends = [ imagemagick ];
   homepage = "regularflolloping.com";
   description = "tA's blog";
   license = stdenv.lib.licenses.bsd3;

rf.cabal

@@ -25,4 +25,5 @@ executable site
                      , filepath
                      , hakyll-favicon
   -- hs-source-dirs:      
+  extra-libraries:     imagemagick
   default-language:    Haskell2010