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-rw-r--r--pkgs/applications/misc/mupdf/default.nix4
1 files changed, 3 insertions, 1 deletions
diff --git a/pkgs/applications/misc/mupdf/default.nix b/pkgs/applications/misc/mupdf/default.nix
index 220309a8e22..17b86910de0 100644
--- a/pkgs/applications/misc/mupdf/default.nix
+++ b/pkgs/applications/misc/mupdf/default.nix
@@ -10,8 +10,10 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ pkgconfig zlib freetype libjpeg jbig2dec openjpeg libX11 libXext ];
 
+  enableParallelBuilding = true;
+
   preBuild = ''
-    export makeFlags="prefix=$out"
+    export makeFlags="prefix=$out build=release"
     export NIX_CFLAGS_COMPILE=" $NIX_CFLAGS_COMPILE -I$(echo ${openjpeg}/include/openjpeg-*) "
   '';