diff --git a/pkgs/development/libraries/qt-5/modules/qtwebkit.nix b/pkgs/development/libraries/qt-5/modules/qtwebkit.nix
index 12e19af75f0f..1133623483af 100644
--- a/pkgs/development/libraries/qt-5/modules/qtwebkit.nix
+++ b/pkgs/development/libraries/qt-5/modules/qtwebkit.nix
@@ -34,9 +34,6 @@ qtModule {
     bison flex gdb gperf perl pkgconfig python2 ruby
   ] ++ optional usingAnnulenWebkitFork cmake;
 
-  # Temporary fix for https://github.com/NixOS/nixpkgs/commit/be1b22538a60e52987d238bb11f93043682b6e9a
-  setOutputFlags = true;
-
   cmakeFlags = optionals usingAnnulenWebkitFork ([ "-DPORT=Qt" ]
     ++ optionals stdenv.isDarwin [
       "-DQt5Multimedia_DIR=${getDev qtmultimedia}/lib/cmake/Qt5Multimedia"
diff --git a/pkgs/development/tools/build-managers/cmake/setup-hook.sh b/pkgs/development/tools/build-managers/cmake/setup-hook.sh
index b343e1f91fce..87bbefa6bbfa 100755
--- a/pkgs/development/tools/build-managers/cmake/setup-hook.sh
+++ b/pkgs/development/tools/build-managers/cmake/setup-hook.sh
@@ -68,24 +68,19 @@ cmakeConfigurePhase() {
     # nix/store directory.
     cmakeFlags="-DCMAKE_INSTALL_NAME_DIR=${!outputLib}/lib $cmakeFlags"
 
-    if [ "$outputs" != "out" -a -n "${setOutputFlags-1}" ]; then
-        # This ensures correct paths with multiple output derivations
-        # It requires the project to use variables from GNUInstallDirs module
-        # https://cmake.org/cmake/help/latest/module/GNUInstallDirs.html
-        cmakeFlags="-DCMAKE_INSTALL_BINDIR=${!outputBin}/bin $cmakeFlags"
-        cmakeFlags="-DCMAKE_INSTALL_SBINDIR=${!outputBin}/sbin $cmakeFlags"
-        cmakeFlags="-DCMAKE_INSTALL_INCLUDEDIR=${!outputInclude}/include $cmakeFlags"
-        cmakeFlags="-DCMAKE_INSTALL_OLDINCLUDEDIR=${!outputInclude}/include $cmakeFlags"
-        cmakeFlags="-DCMAKE_INSTALL_MANDIR=${!outputMan}/share/man $cmakeFlags"
-        cmakeFlags="-DCMAKE_INSTALL_INFODIR=${!outputInfo}/share/info $cmakeFlags"
-        cmakeFlags="-DCMAKE_INSTALL_DOCDIR=${!outputDoc}/share/doc/${shareDocName} $cmakeFlags"
-        cmakeFlags="-DCMAKE_INSTALL_LIBEXECDIR=${!outputLib}/libexec $cmakeFlags"
-        cmakeFlags="-DCMAKE_INSTALL_LOCALEDIR=${!outputLib}/share/locale $cmakeFlags"
-    fi
-
-    # This output flag must always be set, unlike the others, because
-    # otherwise we end up with lib64.
+    # This ensures correct paths with multiple output derivations
+    # It requires the project to use variables from GNUInstallDirs module
+    # https://cmake.org/cmake/help/latest/module/GNUInstallDirs.html
+    cmakeFlags="-DCMAKE_INSTALL_BINDIR=${!outputBin}/bin $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_SBINDIR=${!outputBin}/sbin $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_INCLUDEDIR=${!outputInclude}/include $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_OLDINCLUDEDIR=${!outputInclude}/include $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_MANDIR=${!outputMan}/share/man $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_INFODIR=${!outputInfo}/share/info $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_DOCDIR=${!outputDoc}/share/doc/${shareDocName} $cmakeFlags"
     cmakeFlags="-DCMAKE_INSTALL_LIBDIR=${!outputLib}/lib $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_LIBEXECDIR=${!outputLib}/libexec $cmakeFlags"
+    cmakeFlags="-DCMAKE_INSTALL_LOCALEDIR=${!outputLib}/share/locale $cmakeFlags"
 
     # Don’t build tests when doCheck = false
     if [ -z "${doCheck-}" ]; then
@@ -120,6 +115,7 @@ cmakeConfigurePhase() {
 }
 
 if [ -z "${dontUseCmakeConfigure-}" -a -z "${configurePhase-}" ]; then
+    setOutputFlags=
     configurePhase=cmakeConfigurePhase
 fi