hylafaxplus: disable parallel build

pkgs/servers/hylafaxplus/default.nix

@@ -87,6 +87,10 @@ stdenv.mkDerivation {
     openldap  # optional
     pam  # optional
   ];
+  # Disable parallel build, errors:
+  #  *** No rule to make target '../util/libfaxutil.so.7.0.4', needed by 'faxmsg'.  Stop.
+  enableParallelBuilding = false;
+
   postPatch = ". ${postPatch}";
   dontAddPrefix = true;
   postInstall = ". ${postInstall}";