diff --git a/pkgs/development/interpreters/io/default.nix b/pkgs/development/interpreters/io/default.nix
index 6e604d22df7..6bbf8aeba05 100644
--- a/pkgs/development/interpreters/io/default.nix
+++ b/pkgs/development/interpreters/io/default.nix
@@ -8,7 +8,7 @@ let
   buildInputs = with args; [
     zlib sqlite gmp libffi cairo ncurses freetype mesa
     libpng libtiff libjpeg readline libsndfile libxml2
-    freeglut e2fsprogs libsamplerate pcre
+    freeglut e2fsprogs libsamplerate pcre libevent editline
   ];
 in
 rec {
@@ -30,7 +30,10 @@ rec {
   preBuild = FullDepEntry (''
     for i in $pkgs ${
         if args.stdenv ? glibc then args.stdenv.glibc else ""
+      } ${
+        if args ? libffi &&  args.libffi != null then "$(echo ${args.libffi}/lib/*/include/..)" else ""
       }; do
+        echo "Path: $i"
         sed -i build/AddonBuilder.io -e '/"\/sw"/asearchPrefixes append("'"$i"'"); '
     done
   '') ["minInit" "addInputs" "doUnpack"];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c0cb39c6183..268ad89633b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1982,7 +1982,7 @@ let
   io = builderDefsPackage (import ../development/interpreters/io) {
     inherit sqlite zlib gmp libffi cairo ncurses freetype mesa
       libpng libtiff libjpeg readline libsndfile libxml2
-      freeglut e2fsprogs libsamplerate pcre;
+      freeglut e2fsprogs libsamplerate pcre libevent editline;
   };
 
   kaffe =  import ../development/interpreters/kaffe {