add libdl for linux OpenGL3

examples/align/CMakeLists.txt

@@ -9,6 +9,15 @@ if(BUILD_GRAPHICAL_EXAMPLES)
 add_executable( ${PROJECT_NAME} rs-align.cpp ${IMGUI_SOURCES})
 set_property( TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11 )
 target_link_libraries( ${PROJECT_NAME} ${DEPENDENCIES} )
+# Check the platform and conditionally link OpenGL and libdl
+if(WIN32)
+    # For Windows, we don't need libdl, use Windows dynamic loading
+    target_link_libraries(${PROJECT_NAME} OpenGL::GL)
+else()
+    # For non-Windows (Unix-like systems), link OpenGL and libdl
+    find_package(OpenGL REQUIRED)
+    target_link_libraries(${PROJECT_NAME} OpenGL::GL dl)
+endif()
 include_directories( ../../third-party/imgui ../../examples )
 set_target_properties( ${PROJECT_NAME} PROPERTIES FOLDER Examples )
 using_easyloggingpp( ${PROJECT_NAME} SHARED )