diff --git a/pkgs/applications/misc/syncthingtray/default.nix b/pkgs/applications/misc/syncthingtray/default.nix
index 96e77baf3025..65c80cc81f1c 100644
--- a/pkgs/applications/misc/syncthingtray/default.nix
+++ b/pkgs/applications/misc/syncthingtray/default.nix
@@ -70,7 +70,8 @@ mkDerivation rec {
   cmakeFlags = [
     "-DAUTOSTART_EXEC_PATH=${autostartExecPath}"
     # See https://github.com/Martchus/syncthingtray/issues/42
-    "-DQT_PLUGIN_DIR:STRING=${placeholder "out"}/lib/qt-5"
+    "-DQT_PLUGIN_DIR:STRING=${placeholder "out"}/${qtbase.qtPluginPrefix}"
+    "-DBUILD_SHARED_LIBS=ON"
   ] ++ lib.optionals (!plasmoidSupport) ["-DNO_PLASMOID=ON"]
     ++ lib.optionals (!kioPluginSupport) ["-DNO_FILE_ITEM_ACTION_PLUGIN=ON"]
     ++ lib.optionals systemdSupport ["-DSYSTEMD_SUPPORT=ON"]
diff --git a/pkgs/development/libraries/cpp-utilities/default.nix b/pkgs/development/libraries/cpp-utilities/default.nix
index 45a87690e197..c3731c0e7a75 100644
--- a/pkgs/development/libraries/cpp-utilities/default.nix
+++ b/pkgs/development/libraries/cpp-utilities/default.nix
@@ -22,6 +22,9 @@ stdenv.mkDerivation rec {
   buildInputs = lib.optionals stdenv.isDarwin [
     iconv # needed on Darwin, see https://github.com/Martchus/cpp-utilities/issues/4
   ];
+
+  cmakeFlags = ["-DBUILD_SHARED_LIBS=ON"];
+
   # Otherwise, tests fail since the resulting shared object libc++utilities.so is only available in PWD of the make files
   preCheck = ''
     checkFlagsArray+=(
diff --git a/pkgs/development/libraries/qtutilities/default.nix b/pkgs/development/libraries/qtutilities/default.nix
index 9b866a26e698..93ecaa698f7a 100644
--- a/pkgs/development/libraries/qtutilities/default.nix
+++ b/pkgs/development/libraries/qtutilities/default.nix
@@ -21,6 +21,8 @@ stdenv.mkDerivation rec {
   buildInputs = [ qtbase cpp-utilities ];
   nativeBuildInputs = [ cmake qttools ];
 
+  cmakeFlags = ["-DBUILD_SHARED_LIBS=ON"];
+
   dontWrapQtApps = true;
 
   meta = with lib; {