From a7de5d176f6b93ab6d3ca11a7d5b9c2df5938aa6 Mon Sep 17 00:00:00 2001
From: Farhang <46557204+farhangnaderi@users.noreply.github.com>
Date: Thu, 4 Dec 2025 07:52:02 -0500
Subject: [PATCH] Permission error gz build fix (#25921)

---
 .../simulation/gz_plugins/optical_flow/optical_flow.cmake   | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/src/modules/simulation/gz_plugins/optical_flow/optical_flow.cmake b/src/modules/simulation/gz_plugins/optical_flow/optical_flow.cmake
index 2dcc7d074d..f7486aa1fc 100644
--- a/src/modules/simulation/gz_plugins/optical_flow/optical_flow.cmake
+++ b/src/modules/simulation/gz_plugins/optical_flow/optical_flow.cmake
@@ -35,11 +35,7 @@ include(ExternalProject)
 find_package(OpenCV REQUIRED)
 
 if(NOT TARGET OpticalFlow)
-    if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
-        set(OPTICAL_FLOW_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/OpticalFlow/install")
-    else()
-        set(OPTICAL_FLOW_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
-    endif()
+    set(OPTICAL_FLOW_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/OpticalFlow/install")
 
     ExternalProject_Add(OpticalFlow
         GIT_REPOSITORY https://github.com/PX4/PX4-OpticalFlow.git