diff --git a/pkgs/tools/typesetting/pdf2djvu/default.nix b/pkgs/tools/typesetting/pdf2djvu/default.nix
index e4613802892e..847477809406 100644
--- a/pkgs/tools/typesetting/pdf2djvu/default.nix
+++ b/pkgs/tools/typesetting/pdf2djvu/default.nix
@@ -15,8 +15,13 @@ stdenv.mkDerivation rec {
 
   preConfigure = ''
     sed -i 's#\$djvulibre_bin_path#${djvulibre.bin}/bin#g' configure
+
+    # Configure skips the failing check for usability of windres when it is nonempty.
+    unset WINDRES
   '';
 
+  enableParallelBuilding = true;
+
   meta = with stdenv.lib; {
     description = "Creates djvu files from PDF files";
     homepage = https://jwilk.net/software/pdf2djvu;