--- a/controllers/easynav_mpc_controller/CMakeLists.txt	2026-10-20 09:29:05.457780465 +0000
+++ b/controllers/easynav_mpc_controller/CMakeLists.txt	2026-10-20 09:29:26.748844852 +0000
@@ -45,7 +45,7 @@
     set(nlopt_download_options DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
   endif()
   externalproject_add(nlopt_bundled
-    URL https://github.com/stevengj/nlopt/archive/refs/tags/v${nlopt_version}.tar.gz
+    URL file://${CMAKE_CURRENT_SOURCE_DIR}/nlopt-${nlopt_version}.tar.gz
     URL_HASH SHA256=53e552d83e9294d67db37f0f4a23f15933a9ef698485301a18b98b40004cf0de
     ${nlopt_download_options}
     CMAKE_ARGS