diff --git a/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/default.nix b/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/default.nix
index af031a6e1a16..aa0bac9a0106 100644
--- a/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/default.nix
+++ b/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/default.nix
@@ -1,4 +1,4 @@
-{ clangStdenv, fetchgit, llvm, clang }:
+{ clangStdenv, fetchgit, llvmPackages, clang }:
 
 clangStdenv.mkDerivation {
   name = "emacs-clang-complete-async-20130218";
@@ -8,7 +8,12 @@ clangStdenv.mkDerivation {
     sha256 = "1c8zqi6axbsb951azz9iqx3j52j30nd9ypv396hvids3g02cirrf";
   };
 
-  buildInputs = [ llvm clang.clang ];
+  buildInputs = [ llvmPackages.llvm ];
+
+  patches = [ ./fix-build.patch ];
+
+  CFLAGS = "-I${llvmPackages.clang}/include";
+  LDFLAGS = "-L${llvmPackages.clang}/lib";
 
   installPhase = ''
     mkdir -p $out/bin
diff --git a/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/fix-build.patch b/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/fix-build.patch
new file mode 100644
index 000000000000..89de339a436b
--- /dev/null
+++ b/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/fix-build.patch
@@ -0,0 +1,10 @@
+--- old/src/completion.h	2014-11-16 16:58:16.625150124 +0100
++++ new/src/completion.h	2014-11-16 16:58:28.020207508 +0100
+@@ -3,6 +3,7 @@
+ 
+ 
+ #include <clang-c/Index.h>
++#include <stdio.h>
+ 
+ 
+ typedef struct __completion_Session_struct