diff --git a/CMakeLists.txt b/CMakeLists.txt
index 16af0b52d0..e37a749597 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -87,21 +87,16 @@ vsg_add_target_docs(
         ${VSG_SOURCE_DIR}/include/vsg
 )
 
-# only provide custom targets if not building as a submodule/FetchContent
-if (${CMAKE_CURRENT_BINARY_DIR} STREQUAL ${CMAKE_SOURCE_DIR})
-
-    # automatically buil_all_h build target to generate the include/vsg/all.h from the headers in the include/vsg/* directories
-    add_custom_target(build_all_h
-        COMMAND ${CMAKE_COMMAND} -P ${VSG_SOURCE_DIR}/cmake/build_all_h.cmake
-    )
-    set_target_properties(build_all_h PROPERTIES FOLDER "VulkanSceneGraph")
-
-    vsg_add_option_maintainer(
-        PREFIX VulkanSceneGraph
-        RCLEVEL ${VSG_RELEASE_CANDIDATE}
-    )
+# automatically buil_all_h build target to generate the include/vsg/all.h from the headers in the include/vsg/* directories
+add_custom_target(build_all_h
+    COMMAND ${CMAKE_COMMAND} -DVSG_SOURCE_DIR=${VSG_SOURCE_DIR} -P ${VSG_SOURCE_DIR}/cmake/build_all_h.cmake
+)
+set_target_properties(build_all_h PROPERTIES FOLDER "VulkanSceneGraph")
 
-endif()
+vsg_add_option_maintainer(
+    PREFIX VulkanSceneGraph
+    RCLEVEL ${VSG_RELEASE_CANDIDATE}
+)
 
 #
 # src directory contains all the source of the vsg library
diff --git a/cmake/build_all_h.cmake b/cmake/build_all_h.cmake
index 6d686f8961..959b5de2a5 100644
--- a/cmake/build_all_h.cmake
+++ b/cmake/build_all_h.cmake
@@ -9,24 +9,24 @@ endmacro()
 
 macro(BUILD_ALL_H)
 
-    set(INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include)
-
-    file(GLOB CORE_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/core/*.h )
-    file(GLOB MATHS_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/maths/*.h )
-    file(GLOB NODES_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/nodes/*.h )
-    file(GLOB THREADING_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/threading/*.h )
-    file(GLOB UI_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/ui/*.h )
-    file(GLOB UTILS_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/utils/*.h )
-    file(GLOB APP_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/app/*.h )
-    file(GLOB IO_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/io/*.h )
-    file(GLOB VK_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/vk/*.h )
-    file(GLOB COMMANDS_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/commands/*.h )
-    file(GLOB STATE_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/state/*.h )
-    file(GLOB TEXT_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/text/*.h )
-    file(GLOB RAYTRACING_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/raytracing/*.h )
-    file(GLOB RTX_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include include/vsg/rtx/*.h )
-
-    file(READ ${CMAKE_CURRENT_SOURCE_DIR}/cmake/header_license_preamble.txt ALL_H_CONTENTS)
+    set(INCLUDE_DIR ${VSG_SOURCE_DIR}/include)
+
+    file(GLOB CORE_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/core/*.h RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/include ${CMAKE_CURRENT_SOURCE_DIR}/include/vsg/core/*.h )
+    file(GLOB MATHS_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/maths/*.h )
+    file(GLOB NODES_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/nodes/*.h )
+    file(GLOB THREADING_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/threading/*.h )
+    file(GLOB UI_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/ui/*.h )
+    file(GLOB UTILS_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/utils/*.h )
+    file(GLOB APP_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/app/*.h )
+    file(GLOB IO_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/io/*.h )
+    file(GLOB VK_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/vk/*.h )
+    file(GLOB COMMANDS_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/commands/*.h )
+    file(GLOB STATE_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/state/*.h )
+    file(GLOB TEXT_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/text/*.h )
+    file(GLOB RAYTRACING_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/raytracing/*.h )
+    file(GLOB RTX_HEADERS RELATIVE ${INCLUDE_DIR} ${INCLUDE_DIR}/vsg/rtx/*.h )
+
+    file(READ ${VSG_SOURCE_DIR}/cmake/header_license_preamble.txt ALL_H_CONTENTS)
     APPEND_INCLUDES(ALL_H_CONTENTS CORE_HEADERS "// Core header files\n")
     APPEND_INCLUDES(ALL_H_CONTENTS MATHS_HEADERS "// Maths header files\n")
     APPEND_INCLUDES(ALL_H_CONTENTS NODES_HEADERS "// Node header files\n")
@@ -42,7 +42,7 @@ macro(BUILD_ALL_H)
     APPEND_INCLUDES(ALL_H_CONTENTS RAYTRACING_HEADERS "// Ray tracing header files\n")
     APPEND_INCLUDES(ALL_H_CONTENTS RTX_HEADERS "// RTX mesh  header files\n")
 
-    file(WRITE include/vsg/all.h ${ALL_H_CONTENTS})
+    file(WRITE ${INCLUDE_DIR}/vsg/all.h ${ALL_H_CONTENTS})
 
 endmacro()