diff --git a/Z/src/ngltools/CMakeLists.txt b/Z/src/ngltools/CMakeLists.txt
index 6419e56ab..aaad14447 100755
--- a/Z/src/ngltools/CMakeLists.txt
+++ b/Z/src/ngltools/CMakeLists.txt
@@ -37,8 +37,16 @@ IF(BUILD_TESTING)
   endif()
 
   if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/tests/NGLToolsQtSmokeTest.cpp)
-    add_executable(ngltools_qt_smoke tests/NGLToolsQtSmokeTest.cpp)
-    target_link_libraries(ngltools_qt_smoke PRIVATE ngltools ${_QTTEST_TARGET} ${_QTCORE_TARGET})
+    if(TARGET ngltools)
+      add_executable(ngltools_qt_smoke tests/NGLToolsQtSmokeTest.cpp)
+      target_link_libraries(ngltools_qt_smoke PRIVATE ngltools ${_QTTEST_TARGET} ${_QTCORE_TARGET})
+    else()
+      # Build the smoke test as a standalone executable using the dtg implementation
+      # when the ngltools library target is not available in this configuration.
+      add_executable(ngltools_qt_smoke tests/NGLToolsQtSmokeTest.cpp ${CMAKE_CURRENT_SOURCE_DIR}/ngltools_dtg.cpp)
+      target_include_directories(ngltools_qt_smoke PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+      target_link_libraries(ngltools_qt_smoke PRIVATE ${_QTTEST_TARGET} ${_QTCORE_TARGET})
+    endif()
     add_test(NAME NGLToolsQtSmoke COMMAND ngltools_qt_smoke)
   endif()
 ENDIF()
diff --git a/Z/src/ngltools/tests/NGLToolsQtSmokeTest.cpp b/Z/src/ngltools/tests/NGLToolsQtSmokeTest.cpp
index 28146a350..d71671985 100644
--- a/Z/src/ngltools/tests/NGLToolsQtSmokeTest.cpp
+++ b/Z/src/ngltools/tests/NGLToolsQtSmokeTest.cpp
@@ -11,7 +11,7 @@ private slots:
     void testDTG()
     {
         QDateTime now = QDateTime::currentDateTimeUtc();
-        QString s = DTG::toString(now);
+        QString s = DTG::toString(now, DTG::Default, DTG::DTG);
         QVERIFY(!s.isEmpty());
         bool ok = false;
         QDateTime parsed = DTG::fromDTGString(s, &ok);