--- CMakeLists.txt.orig	2026-04-24 17:35:17
+++ CMakeLists.txt	2026-05-10 23:43:41
@@ -245,7 +245,6 @@
     set(CMAKE_MFC_FLAG 0)
 endif(WIN32)
 if(APPLE)
-    set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -undefined dynamic_lookup")
 endif(APPLE)
 
 #######################################################################
@@ -277,13 +276,13 @@
     find_package(TCL 8.5 REQUIRED)
     find_package(TclStub 8.5 REQUIRED)
     find_package(Threads REQUIRED)
-    if(APPLE)
+    if(APPLE AND MACPORTS_NO_X11)
           set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -framework AppKit")
           target_link_libraries(netgen_gui INTERFACE "-framework AppKit")
-    else(APPLE)
+    else(APPLE AND MACPORTS_NO_X11)
           find_package(X11 REQUIRED) 
           target_link_libraries( netgen_gui INTERFACE ${X11_Xmu_LIB} ${X11_X11_LIB})
-    endif(APPLE)
+    endif(APPLE AND MACPORTS_NO_X11)
     find_package(OpenGL REQUIRED)
 
     target_compile_definitions(netgen_gui INTERFACE -DTCL -DOPENGL -DUSE_TOGL_2 -DUSE_TCL_STUBS -DUSE_TK_STUBS)
@@ -301,10 +300,10 @@
     if(WIN32)
       target_compile_definitions(netgen_gui INTERFACE -DTOGL_WGL)
     endif()
-    if(APPLE)
+    if(APPLE AND MACPORTS_NO_X11)
       target_compile_definitions(netgen_gui INTERFACE -DTOGL_NSOPENGL)
     endif()
-    if(UNIX AND NOT APPLE)
+    if(UNIX AND NOT MACPORTS_NO_X11)
       target_compile_definitions(netgen_gui INTERFACE -DTOGL_X11)
     endif()