diff --git a/rtabmap_msgs/CMakeLists.txt b/rtabmap_msgs/CMakeLists.txt
index 01e7cebb..d40b0c34 100644
--- a/rtabmap_msgs/CMakeLists.txt
+++ b/rtabmap_msgs/CMakeLists.txt
@@ -11,11 +11,12 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 endif()
 
 if(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
-  # issues #1285 #1288
+  # issues #1285 #1288 (best-effort probes: not REQUIRED, a phantom miss under
+  # emulated arm64 should not fail the build)
   find_library(
     rcutils_LIB NAMES rcutils
     PATHS "/opt/ros/$ENV{ROS_DISTRO}/lib"
-    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH REQUIRED
+    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH
   )
 endif()
 
diff --git a/rtabmap_sync/CMakeLists.txt b/rtabmap_sync/CMakeLists.txt
index 106d23cf..ceda4040 100644
--- a/rtabmap_sync/CMakeLists.txt
+++ b/rtabmap_sync/CMakeLists.txt
@@ -2,16 +2,17 @@ cmake_minimum_required(VERSION 3.5)
 project(rtabmap_sync)
 
 if(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
-  # issues #1285 #1288
+  # issues #1285 #1288 (best-effort probes: not REQUIRED, a phantom miss under
+  # emulated arm64 should not fail the build)
   find_library(
     builtin_interfaces__rosidl_generator_c_LIB NAMES builtin_interfaces__rosidl_generator_c
     PATHS "/opt/ros/$ENV{ROS_DISTRO}/lib"
-    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH REQUIRED
+    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH
   )
   find_library(
     crypto_LIB NAMES crypto
     PATHS "/usr/lib/${CMAKE_SYSTEM_PROCESSOR}-linux-gnu"
-    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH REQUIRED
+    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH
   )
 endif()
 
diff --git a/rtabmap_viz/CMakeLists.txt b/rtabmap_viz/CMakeLists.txt
index add21b02..a5e043d3 100644
--- a/rtabmap_viz/CMakeLists.txt
+++ b/rtabmap_viz/CMakeLists.txt
@@ -6,21 +6,22 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 endif()
 
 if(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
-  # issues #1285 #1288
+  # issues #1285 #1288 (best-effort probes: not REQUIRED, a phantom miss under
+  # emulated arm64 should not fail the build)
   find_library(
     builtin_interfaces__rosidl_generator_c_LIB NAMES builtin_interfaces__rosidl_generator_c
     PATHS "/opt/ros/$ENV{ROS_DISTRO}/lib"
-    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH REQUIRED
+    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH
   )
   find_library(
     rcutils_LIB NAMES rcutils
     PATHS "/opt/ros/$ENV{ROS_DISTRO}/lib"
-    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH REQUIRED
+    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH
   )
   find_library(
     crypto_LIB NAMES crypto
     PATHS "/usr/lib/${CMAKE_SYSTEM_PROCESSOR}-linux-gnu"
-    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH REQUIRED
+    NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH
   )
 endif()