diff --git a/jscomp/bsb/bsb_build_util.ml b/jscomp/bsb/bsb_build_util.ml
index 581fb271e8..acb043deb5 100644
--- a/jscomp/bsb/bsb_build_util.ml
+++ b/jscomp/bsb/bsb_build_util.ml
@@ -54,9 +54,6 @@ let include_dirs_by dirs fn =
     (Ext_list.flat_map dirs (fun x -> ["-I"; Ext_filename.maybe_quote (fn x)]))
 
 
-(* we use lazy $src_root_dir *)
-
-
 
 (* It does several conversion:
    First, it will convert unix path to windows backward on windows platform.
diff --git a/jscomp/bsb/bsb_config.ml b/jscomp/bsb/bsb_config.ml
index 7fdccd802f..d246acf4a2 100644
--- a/jscomp/bsb/bsb_config.ml
+++ b/jscomp/bsb/bsb_config.ml
@@ -52,8 +52,8 @@ let rev_lib_bs_prefix p = rev_lib_bs // p
 
 let ocaml_bin_install_prefix p = lib_ocaml // p
 
-let lazy_src_root_dir = "$src_root_dir" 
-let proj_rel path = lazy_src_root_dir // path
+
+let proj_rel path = rev_lib_bs // path
 
 (** it may not be a bad idea to hard code the binary path 
     of bsb in configuration time
diff --git a/jscomp/bsb/bsb_ninja_gen.ml b/jscomp/bsb/bsb_ninja_gen.ml
index d2bbcb3c56..5e417dd9c7 100644
--- a/jscomp/bsb/bsb_ninja_gen.ml
+++ b/jscomp/bsb/bsb_ninja_gen.ml
@@ -146,7 +146,6 @@ let output_ninja_and_namespace_map
     Bsb_ninja_targets.output_kvs
       [|
         Bsb_ninja_global_vars.g_pkg_flg, g_pkg_flg ; 
-        Bsb_ninja_global_vars.src_root_dir, per_proj_dir (* TODO: need check its integrity -- allow relocate or not? *);
         (* The path to [bsc.exe] independent of config  *)
         Bsb_ninja_global_vars.bsc, (Ext_filename.maybe_quote Bsb_global_paths.vendor_bsc);
         (* The path to [bsb_heler.exe] *)
diff --git a/jscomp/bsb/bsb_ninja_global_vars.ml b/jscomp/bsb/bsb_ninja_global_vars.ml
index c0c6f2a548..b483deb35c 100644
--- a/jscomp/bsb/bsb_ninja_global_vars.ml
+++ b/jscomp/bsb/bsb_ninja_global_vars.ml
@@ -28,7 +28,6 @@ let g_pkg_flg = "g_pkg_flg"
 
 let bsc = "bsc" 
 
-let src_root_dir = "src_root_dir"
 let bsdep = "bsdep"
 
 let bsc_flags = "bsc_flags"
@@ -37,7 +36,6 @@ let ppx_flags = "ppx_flags"
 
 let pp_flags = "pp_flags"
 
-
 let g_dpkg_incls = "g_dpkg_incls"
 
 let refmt = "refmt"
diff --git a/jscomp/core/bs_conditional_initial.ml b/jscomp/core/bs_conditional_initial.ml
index 17dd59a486..48092c7c1e 100644
--- a/jscomp/core/bs_conditional_initial.ml
+++ b/jscomp/core/bs_conditional_initial.ml
@@ -32,6 +32,7 @@ let setup_env () =
   Clflags.no_std_include := true;
   Warnings.parse_options false Bsc_warnings.defaults_w;
   Warnings.parse_options true Bsc_warnings.defaults_warn_error;
+  Location.absname := true;
   Clflags.dump_location := false;  
   Clflags.compile_only := true;
   Config.bs_only := true;  
diff --git a/jscomp/snapshot.ninja b/jscomp/snapshot.ninja
index 7baab70887..46ad5cf400 100644
--- a/jscomp/snapshot.ninja
+++ b/jscomp/snapshot.ninja
@@ -17,48 +17,45 @@ SNAP=../lib/$snapshot_path
 
 build snapshot: phony  $SNAP/whole_compiler.ml   $SNAP/bsb_helper.ml $SNAP/bsb.ml $SNAP/bspp.ml $SNAP/unstable/all_ounit_tests.ml
 
-build $SNAP/whole_compiler.ml: bspack | ./bin/bspack.exe
+build $SNAP/whole_compiler.ml: bspack | ./bin/bspack.exe $LTO
     flags = ${releaseMode} -bs-MD -module-alias Config=Config_whole_compiler -bs-exclude-I config  -I $OCAML_SRC_UTILS -I $OCAML_SRC_PARSING -I $OCAML_SRC_TYPING -I $OCAML_SRC_BYTECOMP -I $OCAML_SRC_DRIVER   ${includes}
     main = Js_main
     post_process = && node $LTO $SNAP/whole_compiler.ml
 
-
-
-build $SNAP/bsb_helper.ml: bspack | ./bin/bspack.exe
+build $SNAP/bsb_helper.ml: bspack | ./bin/bspack.exe $LTO
      flags = -bs-MD ${releaseMode}   -I stubs -I common -I ext -I syntax -I depends -I bsb_helper  -I main 
      main = Bsb_helper_main 
 
-build $SNAP/bsb.ml: bspack | ./bin/bspack.exe
+build $SNAP/bsb.ml: bspack | ./bin/bspack.exe $LTO
      flags =   -D BS_MIN_LEX_DEPS=true -bs-MD ${releaseMode} -I $OCAML_SRC_UTILS -I $OCAML_SRC_PARSING -I stubs -I common -I ext -I syntax -I depends -I bsb -I ext -I main 
      main = Bsb_main 
 
-
-build $SNAP/bspp.ml: bspack | ./bin/bspack.exe
+build $SNAP/bspp.ml: bspack | ./bin/bspack.exe $LTO
      flags = -D BS_MIN_LEX_DEPS=true ${releaseMode} -bs-MD -module-alias Config=Config_whole_compiler   -I $OCAML_SRC_UTILS -I $OCAML_SRC_PARSING?parser   -I common -I ext -I syntax -I depends -I bspp -I core -I main 
      main = Bspp_main 
 
-build $SNAP/unstable/bsb_native.ml: bspack | ./bin/bspack.exe
+build $SNAP/unstable/bsb_native.ml: bspack | ./bin/bspack.exe $LTO
      flags =   -D BS_MIN_LEX_DEPS=true -D BS_NATIVE=true -bs-MD ${releaseMode} -I $OCAML_SRC_UTILS -I $OCAML_SRC_PARSING -I stubs -I common -I ext -I syntax -I depends -I bsb -I ext -I main 
      main = Bsb_main 
      
-build $SNAP/unstable/native_ppx.ml: bspack | ./bin/bspack.exe     
+build $SNAP/unstable/native_ppx.ml: bspack | ./bin/bspack.exe $LTO 
      flags =   -module-alias Config=Config_whole_compiler -D BS_MIN_LEX_DEPS=true -D BS_NATIVE=true -bs-MD ${releaseMode} -I $OCAML_SRC_UTILS -I $OCAML_SRC_PARSING -I stubs -I common -I ext -I syntax -I depends -I bsb -I ext -I core -I main 
      main = Native_ppx_main
 
 
-build $SNAP/unstable/all_ounit_tests.ml: bspack | ./bin/bspack.exe
+build $SNAP/unstable/all_ounit_tests.ml: bspack | ./bin/bspack.exe $LTO
     flags =  -bs-MD    -I ounit -I ounit_tests  -I stubs -I bsb -I bsb_helper -I common -I ext -I syntax -I depends -I bspp -I core -I main
     main = Ounit_tests_main         
 
-build $SNAP/unstable/bspack.ml: bspack | ./bin/bspack.exe 
+build $SNAP/unstable/bspack.ml: bspack | ./bin/bspack.exe $LTO
     flags = -bs-MD -module-alias Config=Config_whole_compiler  -I $OCAML_SRC_PARSING -I $OCAML_SRC_UTILS -I stubs -I ext -I common -I depends -I core -I main -bs-main Bspack_main
     main = Bspack_main
 
-build $SNAP/unstable/js_compiler.ml: bspack | ./bin/bspack.exe
+build $SNAP/unstable/js_compiler.ml: bspack | ./bin/bspack.exe $LTO
     flags = -D BS_BROWSER=true -bs-MD  -module-alias Config=Config_whole_compiler  -bs-exclude-I config   -I $OCAML_SRC_UTILS -I $OCAML_SRC_PARSING -I $OCAML_SRC_TYPING -I $OCAML_SRC_BYTECOMP -I $OCAML_SRC_DRIVER -I stubs -I ext -I syntax -I depends -I common -I core -I super_errors -I bsb -I outcome_printer -I js_parser -I main
     main  = Jsoo_main
 
-build $SNAP/unstable/js_refmt_compiler.ml: bspack | ./bin/bspack.exe
+build $SNAP/unstable/js_refmt_compiler.ml: bspack | ./bin/bspack.exe $LTO
     flags = -D BS_BROWSER=true -bs-MD  -module-alias Config=Config_whole_compiler  -bs-exclude-I config   -I $OCAML_SRC_UTILS -I $OCAML_SRC_PARSING -I $OCAML_SRC_TYPING -I $OCAML_SRC_BYTECOMP -I $OCAML_SRC_DRIVER -I js_parser -I stubs -I ext -I syntax -I depends -I common -I core -I super_errors -I bsb -I outcome_printer -I js_parser -I main -I refmt
     main  = Jsoo_refmt_main
 
diff --git a/lib/4.06.1/bsb.ml b/lib/4.06.1/bsb.ml
index 5ea8aaab80..f094e42e5b 100644
--- a/lib/4.06.1/bsb.ml
+++ b/lib/4.06.1/bsb.ml
@@ -5187,8 +5187,8 @@ let rev_lib_bs_prefix p = rev_lib_bs // p
 
 let ocaml_bin_install_prefix p = lib_ocaml // p
 
-let lazy_src_root_dir = "$src_root_dir" 
-let proj_rel path = lazy_src_root_dir // path
+
+let proj_rel path = rev_lib_bs // path
 
 (** it may not be a bad idea to hard code the binary path 
     of bsb in configuration time
@@ -9754,9 +9754,6 @@ let include_dirs_by dirs fn =
     (Ext_list.flat_map dirs (fun x -> ["-I"; Ext_filename.maybe_quote (fn x)]))
 
 
-(* we use lazy $src_root_dir *)
-
-
 
 (* It does several conversion:
    First, it will convert unix path to windows backward on windows platform.
@@ -12590,7 +12587,6 @@ let g_pkg_flg = "g_pkg_flg"
 
 let bsc = "bsc" 
 
-let src_root_dir = "src_root_dir"
 let bsdep = "bsdep"
 
 let bsc_flags = "bsc_flags"
@@ -12599,7 +12595,6 @@ let ppx_flags = "ppx_flags"
 
 let pp_flags = "pp_flags"
 
-
 let g_dpkg_incls = "g_dpkg_incls"
 
 let refmt = "refmt"
@@ -13688,7 +13683,6 @@ let output_ninja_and_namespace_map
     Bsb_ninja_targets.output_kvs
       [|
         Bsb_ninja_global_vars.g_pkg_flg, g_pkg_flg ; 
-        Bsb_ninja_global_vars.src_root_dir, per_proj_dir (* TODO: need check its integrity -- allow relocate or not? *);
         (* The path to [bsc.exe] independent of config  *)
         Bsb_ninja_global_vars.bsc, (Ext_filename.maybe_quote Bsb_global_paths.vendor_bsc);
         (* The path to [bsb_heler.exe] *)
diff --git a/lib/4.06.1/refmt_main3.ml b/lib/4.06.1/refmt_main3.ml
index 19a00af1ed..bf76f8c3cf 100644
--- a/lib/4.06.1/refmt_main3.ml
+++ b/lib/4.06.1/refmt_main3.ml
@@ -161685,7 +161685,7 @@ let refmt_t =
               $ heuristics_file
               $ in_place
               $ input
-
+let () = Location.absname := true
 let () =
   match Term.eval ((Term.ret refmt_t), top_level_info) with
   | `Error _ -> exit 1
diff --git a/lib/4.06.1/unstable/bsb_native.ml b/lib/4.06.1/unstable/bsb_native.ml
index ffecd150af..4cd9fb9720 100644
--- a/lib/4.06.1/unstable/bsb_native.ml
+++ b/lib/4.06.1/unstable/bsb_native.ml
@@ -5193,8 +5193,8 @@ let rev_lib_bs_prefix p = rev_lib_bs // p
 
 let ocaml_bin_install_prefix p = lib_ocaml // p
 
-let lazy_src_root_dir = "$src_root_dir" 
-let proj_rel path = lazy_src_root_dir // path
+
+let proj_rel path = rev_lib_bs // path
 
 (** it may not be a bad idea to hard code the binary path 
     of bsb in configuration time
@@ -9760,9 +9760,6 @@ let include_dirs_by dirs fn =
     (Ext_list.flat_map dirs (fun x -> ["-I"; Ext_filename.maybe_quote (fn x)]))
 
 
-(* we use lazy $src_root_dir *)
-
-
 
 (* It does several conversion:
    First, it will convert unix path to windows backward on windows platform.
@@ -12739,7 +12736,6 @@ let g_pkg_flg = "g_pkg_flg"
 
 let bsc = "bsc" 
 
-let src_root_dir = "src_root_dir"
 let bsdep = "bsdep"
 
 let bsc_flags = "bsc_flags"
@@ -12748,7 +12744,6 @@ let ppx_flags = "ppx_flags"
 
 let pp_flags = "pp_flags"
 
-
 let g_dpkg_incls = "g_dpkg_incls"
 
 let refmt = "refmt"
@@ -13837,7 +13832,6 @@ let output_ninja_and_namespace_map
     Bsb_ninja_targets.output_kvs
       [|
         Bsb_ninja_global_vars.g_pkg_flg, g_pkg_flg ; 
-        Bsb_ninja_global_vars.src_root_dir, per_proj_dir (* TODO: need check its integrity -- allow relocate or not? *);
         (* The path to [bsc.exe] independent of config  *)
         Bsb_ninja_global_vars.bsc, (Ext_filename.maybe_quote Bsb_global_paths.vendor_bsc);
         (* The path to [bsb_heler.exe] *)
diff --git a/lib/4.06.1/unstable/js_compiler.ml b/lib/4.06.1/unstable/js_compiler.ml
index 302178f613..a6dcdf73a8 100644
--- a/lib/4.06.1/unstable/js_compiler.ml
+++ b/lib/4.06.1/unstable/js_compiler.ml
@@ -78368,6 +78368,7 @@ let setup_env () =
   Clflags.no_std_include := true;
   Warnings.parse_options false Bsc_warnings.defaults_w;
   Warnings.parse_options true Bsc_warnings.defaults_warn_error;
+  Location.absname := true;
   Clflags.dump_location := false;  
   Clflags.compile_only := true;
   Config.bs_only := true;  
diff --git a/lib/4.06.1/unstable/js_refmt_compiler.ml b/lib/4.06.1/unstable/js_refmt_compiler.ml
index 9a21d43c35..1418d68d28 100644
--- a/lib/4.06.1/unstable/js_refmt_compiler.ml
+++ b/lib/4.06.1/unstable/js_refmt_compiler.ml
@@ -78368,6 +78368,7 @@ let setup_env () =
   Clflags.no_std_include := true;
   Warnings.parse_options false Bsc_warnings.defaults_w;
   Warnings.parse_options true Bsc_warnings.defaults_warn_error;
+  Location.absname := true;
   Clflags.dump_location := false;  
   Clflags.compile_only := true;
   Config.bs_only := true;  
diff --git a/lib/4.06.1/whole_compiler.ml b/lib/4.06.1/whole_compiler.ml
index ac6b1b9c25..9afa4fe794 100644
--- a/lib/4.06.1/whole_compiler.ml
+++ b/lib/4.06.1/whole_compiler.ml
@@ -4589,7 +4589,7 @@ let absolute_path s = (* This function could go into Filename *)
   aux s
 
 let show_filename file =
-  if !absname then absolute_path file else file
+  if true then absolute_path file else file
 
 let print_filename ppf file =
   Format.fprintf ppf "%s" (show_filename file)
@@ -361937,6 +361937,7 @@ let setup_env () =
   Clflags.no_std_include := true;
   Warnings.parse_options false Bsc_warnings.defaults_w;
   Warnings.parse_options true Bsc_warnings.defaults_warn_error;
+  Location.absname := true;
   Clflags.dump_location := false;  
   Clflags.compile_only := true;
   Config.bs_only := true;  
@@ -362623,7 +362624,7 @@ let read_one_param ppf position name v =
       set "remove-unused-arguments" [ remove_unused_arguments ] v
 
   | "inlining-report" ->
-      if !native_code then
+      if false then
         set "inlining-report" [ inlining_report ] v
 
   | "flambda-verbose" ->
@@ -362679,7 +362680,7 @@ let read_one_param ppf position name v =
 
 
   | "cmo" | "cma" ->
-    if not !native_code then
+    if not false then
     begin
       match position with
       | Before_link | Before_compile _ ->
@@ -362689,7 +362690,7 @@ let read_one_param ppf position name v =
     end
 
   | "cmx" | "cmxa" ->
-    if !native_code then
+    if false then
     begin
       match position with
       | Before_link | Before_compile _ ->
@@ -362699,7 +362700,7 @@ let read_one_param ppf position name v =
     end
 
   | "pic" ->
-    if !native_code then
+    if false then
       set "pic" [ pic_code ] v
 
   | "can-discard" ->
@@ -362886,7 +362887,7 @@ let process_action
       else if Filename.check_suffix name Config.ext_obj
            || Filename.check_suffix name Config.ext_lib then
         ccobjs := name :: !ccobjs
-      else if not !native_code && Filename.check_suffix name Config.ext_dll then
+      else if not false && Filename.check_suffix name Config.ext_dll then
         dllibs := name :: !dllibs
       else
         raise(Arg.Bad("don't know what to do with " ^ name))
diff --git a/scripts/buckle_lto.js b/scripts/buckle_lto.js
index 29137af348..ac7d27528a 100644
--- a/scripts/buckle_lto.js
+++ b/scripts/buckle_lto.js
@@ -7,15 +7,29 @@ var pairs = [
   ["Clflags.unsafe_string", "false"],
   ["Clflags.record_event_when_debug", "false"],
   ["Clflags.no_std_include", "true"],
-  ["no_std_include", "true"],
   ["Clflags.use_threads", "false"],
   ["Clflags.use_vmthreads", "false"],
   ["Clflags.no_implicit_current_dir", "true"],
   ["Clflags.strict_sequence", "true"],
   ["Clflags.strict_formats", "true"],
+  ["Location.absname", "true"],
 ];
 
-var regexp = RegExp(`${pairs.map((x) => "!" + x[0]).join("|")}`, "g");
+var regexp = RegExp(
+  `${pairs
+    .map((x) => {
+      let result = [];
+      result.push("!" + x[0]);
+      let xs = x[0].split(".");
+      if (xs.length === 2 && xs[1]) {
+        result.push("!" + xs[1]);
+      }
+      return result;
+    })
+    .flat()
+    .join("|")}`,
+  "g"
+);
 
 /**
  *
@@ -24,7 +38,8 @@ var regexp = RegExp(`${pairs.map((x) => "!" + x[0]).join("|")}`, "g");
 function transform(s) {
   return s.replace(regexp, (s) => {
     for (let [k, v] of pairs) {
-      if (s.includes(k)) {
+      if (s.includes(k.split(".")[1])) {
+        // "bs_only" instead of "Clflags.bs_only"
         return v;
       }
     }
@@ -33,7 +48,7 @@ function transform(s) {
 }
 // transform('!Config.bs_only && Clflags.native && !Clflags.native')
 var file = process.argv[2];
-console.log(`post processing file`, file);
+console.log(`POST-PROCESSING-FILE:`, file);
 fs.writeFileSync(
   file,