diff --git a/cmake/external_projects/tcltk.cmake b/cmake/external_projects/tcltk.cmake
index 4f173787..74ba0129 100644
--- a/cmake/external_projects/tcltk.cmake
+++ b/cmake/external_projects/tcltk.cmake
@@ -93,6 +93,17 @@ elseif(WIN32)
   list(APPEND NETGEN_DEPENDENCIES project_win_extlibs)
 else(WIN32)
     find_package(TCL 8.5 REQUIRED)
+    ExternalProject_Add(project_tkdnd
+      GIT_REPOSITORY https://github.com/petasis/tkdnd.git
+      GIT_TAG d7cfd96087b248255da5349086ef70cc4bbfb619
+      PREFIX ${CMAKE_CURRENT_BINARY_DIR}/tkdnd
+      CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}/lib
+      UPDATE_COMMAND ""
+      LOG_DOWNLOAD 1
+      LOG_BUILD 1
+      LOG_INSTALL 1
+)
+list(APPEND NETGEN_DEPENDENCIES project_tkdnd)
 endif(APPLE)
 
 # Propagate settings to Netgen subproject