diff --git a/CMakeLists.txt b/CMakeLists.txt
index 426c8432..5ed22ef9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -171,35 +171,6 @@ message(STATUS "##### 3rdParty CTPL")
 add_subdirectory(CTPL EXCLUDE_FROM_ALL)
 add_library(oms::3rd::ctpl::header ALIAS ctpl_header_only)
 
-#########################################################################
-## Dear ImGui.
-if (OMS_ENABLE_OMSimulatorGui)
-  message(STATUS "##### 3rdParty Dear ImGui")
-  add_subdirectory(imgui EXCLUDE_FROM_ALL)
-  add_library(oms::3rd::imgui ALIAS imgui)
-endif ()
-
-#########################################################################
-## GLFW.
-if (OMS_ENABLE_OMSimulatorGui)
-  message(STATUS "##### 3rdParty GLFW")
-  set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
-  set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
-  set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
-  set(GLFW_BUILD_WAYLAND OFF CACHE BOOL "" FORCE)
-
-  add_subdirectory(glfw EXCLUDE_FROM_ALL)
-  add_library(oms::3rd::GLFW ALIAS glfw)
-endif ()
-
-#########################################################################
-## tinyfiledialogs.
-if (OMS_ENABLE_OMSimulatorGui)
-  message(STATUS "##### 3rdParty tinyfiledialogs")
-  add_subdirectory(tinyfd EXCLUDE_FROM_ALL)
-  add_library(oms::3rd::tinyfd ALIAS tinyfd)
-endif ()
-
 #########################################################################
 ## nlohmann/json
 message(STATUS "##### 3rdParty nlohmann/json")
diff --git a/cmake/standalone.cmake b/cmake/standalone.cmake
index 9a331fb3..95ffd3e9 100644
--- a/cmake/standalone.cmake
+++ b/cmake/standalone.cmake
@@ -18,7 +18,6 @@
 # OPENMODELICA_NEW_CMAKE_BUILD is deliberately left undefined: standalone we are
 # not part of the OpenModelica superproject, so 3rdParty configures its own
 # SUNDIALS, exactly like a standalone OMSimulator build does.
-option(OMS_ENABLE_OMSimulatorGui "Enable OMSimulator GUI component" OFF)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CXX_STANDARD_REQUIRED ON)