diff --git a/cmake/ports/glad/portfile.cmake b/cmake/ports/glad/portfile.cmake
index 56ee59e0d4..54b1d91c89 100644
--- a/cmake/ports/glad/portfile.cmake
+++ b/cmake/ports/glad/portfile.cmake
@@ -1,17 +1,19 @@
 include(vcpkg_common_functions)
 vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
 
+file(READ "${VCPKG_ROOT_DIR}/_env/EXTERNAL_BUILD_ASSETS.txt" EXTERNAL_BUILD_ASSETS)
+
 if (ANDROID)
     vcpkg_download_distfile(
         SOURCE_ARCHIVE
-        URLS https://athena-public.s3.amazonaws.com/dependencies/glad/glad32es.zip
+        URLS ${EXTERNAL_BUILD_ASSETS}/dependencies/glad/glad32es.zip
         SHA512 2e02ac633eed8f2ba2adbf96ea85d08998f48dd2e9ec9a88ec3c25f48eaf1405371d258066327c783772fcb3793bdb82bd7375fdabb2ba5e2ce0835468b17f65
     )
 else()
     # else Linux desktop
     vcpkg_download_distfile(
         SOURCE_ARCHIVE
-        URLS https://athena-public.s3.amazonaws.com/dependencies/glad/glad45.zip
+        URLS ${EXTERNAL_BUILD_ASSETS}/dependencies/glad/glad45.zip
         SHA512 653a7b873f9fbc52e0ab95006cc3143bc7b6f62c6e032bc994e87669273468f37978525c9af5efe36f924cb4acd221eb664ad9af0ce4bf711b4f1be724c0065e
         FILENAME glad45.zip
     )
@@ -33,4 +35,3 @@ vcpkg_install_cmake()
 
 file(COPY ${CMAKE_CURRENT_LIST_DIR}/copyright DESTINATION ${CURRENT_PACKAGES_DIR}/share/glad)
 file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
-
diff --git a/cmake/ports/polyvox/portfile.cmake b/cmake/ports/polyvox/portfile.cmake
index 275a1a940f..9204b26dbd 100644
--- a/cmake/ports/polyvox/portfile.cmake
+++ b/cmake/ports/polyvox/portfile.cmake
@@ -1,9 +1,11 @@
 include(vcpkg_common_functions)
 
+file(READ "${VCPKG_ROOT_DIR}/_env/EXTERNAL_BUILD_ASSETS.txt" EXTERNAL_BUILD_ASSETS)
+
 # else Linux desktop
 vcpkg_download_distfile(
     SOURCE_ARCHIVE
-    URLS https://athena-public.s3.amazonaws.com/dependencies/polyvox-master-2015-7-15.zip
+    URLS ${EXTERNAL_BUILD_ASSETS}/dependencies/polyvox-master-2015-7-15.zip
     SHA512 cc04cd43ae74b9c7bb065953540c0048053fcba6b52dc4218b3d9431fba178d65ad4f6c53cc1122ba61d0ab4061e99a7ebbb15db80011d607c5070ebebf8eddc
     FILENAME polyvox.zip
 )
diff --git a/cmake/ports/quazip/portfile.cmake b/cmake/ports/quazip/portfile.cmake
index 7ff2d07173..0789062892 100644
--- a/cmake/ports/quazip/portfile.cmake
+++ b/cmake/ports/quazip/portfile.cmake
@@ -1,10 +1,11 @@
 include(vcpkg_common_functions)
 
 file(READ "${VCPKG_ROOT_DIR}/_env/QT_CMAKE_PREFIX_PATH.txt" QT_CMAKE_PREFIX_PATH)
+file(READ "${VCPKG_ROOT_DIR}/_env/EXTERNAL_BUILD_ASSETS.txt" EXTERNAL_BUILD_ASSETS)
 
 vcpkg_download_distfile(
     SOURCE_ARCHIVE
-    URLS https://athena-public.s3.amazonaws.com/dependencies/quazip-0.7.3.zip
+    URLS ${EXTERNAL_BUILD_ASSETS}/dependencies/quazip-0.7.3.zip
     SHA512 b2d812b6346317fd6d8f4f1344ad48b721d697c429acc8b7e7cb776ce5cba15a59efd64b2c5ae1f31b5a3c928014f084aa1379fd55d8a452a6cf4fd510b3afcc
     FILENAME quazip.zip
 )
diff --git a/cmake/ports/vhacd/portfile.cmake b/cmake/ports/vhacd/portfile.cmake
index 3a13e461a6..4c74bb6532 100644
--- a/cmake/ports/vhacd/portfile.cmake
+++ b/cmake/ports/vhacd/portfile.cmake
@@ -1,10 +1,12 @@
 include(vcpkg_common_functions)
 vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
 
+file(READ "${VCPKG_ROOT_DIR}/_env/EXTERNAL_BUILD_ASSETS.txt" EXTERNAL_BUILD_ASSETS)
+
 # else Linux desktop
 vcpkg_download_distfile(
     SOURCE_ARCHIVE
-    URLS https://athena-public.s3.amazonaws.com/dependencies/v-hacd-master.zip
+    URLS ${EXTERNAL_BUILD_ASSETS}/dependencies/v-hacd-master.zip
     SHA512 5d9bd4872ead9eb3574e4806d6c4f490353a04036fd5f571e1e44f47cb66b709e311abcd53af30bae0015a690152170aeed93209a626c28ebcfd6591f3bb036f
     FILENAME vhacd.zip
 )
@@ -35,4 +37,4 @@ if (WIN32)
         file(RENAME ${CURRENT_PACKAGES_DIR}/debug/lib/Debug/VHACD_LIB.lib ${CURRENT_PACKAGES_DIR}/debug/lib/VHACD.lib)
         file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/lib/Debug)
     endif()
-endif()
\ No newline at end of file
+endif()