diff --git a/configure.py b/configure.py
index de73d9bf..2753901c 100755
--- a/configure.py
+++ b/configure.py
@@ -240,6 +240,7 @@ def DolphinLib(lib_name, objects):
         "lib": lib_name + "D" if config.debug else "",
         "mw_version": "GC/1.2.5n",
         "cflags": cflags_base,
+        "extern": False,
         "host": False,
         "objects": objects,
     }
@@ -250,6 +251,7 @@ def RetroLib(lib_name, objects):
         "lib": lib_name + "CW" + "D" if config.debug else "",
         "mw_version": "GC/1.3.2",
         "cflags": cflags_retro,
+        "extern": False,
         "host": False,
         "objects": objects,
     }
@@ -258,8 +260,10 @@ def RetroLib(lib_name, objects):
 def MusyX(objects, mw_version="GC/1.3.2", debug=False, major=2, minor=0, patch=0):
     cflags = cflags_musyx if not debug else cflags_musyx_debug
     return {
-        "lib": "musyx" + "D" if config.debug else "",
+        "lib": "musyx",
         "mw_version": mw_version,
+        "extern": True,
+        "extern_source": "extern/musyx/src",
         "host": False,
         "cflags": [
             *cflags,
@@ -913,6 +917,7 @@ config.libs = [
         "lib": "zlib",
         "mw_version": "GC/1.3.2",
         "cflags": cflags_runtime,
+        "extern": False,
         "host": False,
         "objects": [
             Object(Matching, "Kyoto/zlib/adler32.c"),
@@ -1110,6 +1115,7 @@ config.libs = [
         "lib": "MSL_C.PPCEABI.bare.H",
         "mw_version": "GC/1.3.2",
         "cflags": cflags_runtime,
+        "extern": False,
         "host": False,
         "objects": [
             Object(Matching, "Runtime/__mem.c"),
@@ -1185,41 +1191,39 @@ config.libs = [
         # minor=5,
         # patch=3,
         objects=[
-            Object(
-                Matching, "musyx/runtime/seq.c", source="extern/musyx/runtime/seq.c"
-            ),
-            Object(Matching, "musyx/runtime/synth.c", source="extern/musyx/synth.c"),
-            Object(Matching, "musyx/runtime/seq_api.c", source="extern/musyx/seq_api.c"),
-            Object(Matching, "musyx/runtime/snd_synthapi.c", source="extern/musyx/snd_synthapi.c"),
-            Object(NonMatching, "musyx/runtime/stream.c", source="extern/musyx/stream.c"),
-            Object(Matching, "musyx/runtime/synthdata.c", source="extern/musyx/synthdata.c"),
-            Object(NonMatching, "musyx/runtime/synthmacros.c", source="extern/musyx/synthmacros.c"),
-            Object(Matching, "musyx/runtime/synthvoice.c", source="extern/musyx/synthvoice.c"),
-            Object(Matching, "musyx/runtime/synth_ac.c", source="extern/musyx/synth_ac.c"),
-            Object(Matching, "musyx/runtime/synth_adsr.c", source="extern/musyx/synth_adsr.c"),
-            Object(Matching, "musyx/runtime/synth_vsamples.c", source="extern/musyx/synth_vsamples.c"),
-            Object(Matching, "musyx/runtime/synth_dbtab.c", source="extern/musyx/synth_dbtab.c"),
-            Object(Matching, "musyx/runtime/s_data.c", source="extern/musyx/s_data.c"),
-            Object(NonMatching, "musyx/runtime/hw_dspctrl.c", source="extern/musyx/hw_dspctrl.c"),
-            Object(Matching, "musyx/runtime/hw_volconv.c", source="extern/musyx/hw_volconv.c"),
-            Object(Matching, "musyx/runtime/snd3d.c", source="extern/musyx/snd3d.c"),
-            Object(Matching, "musyx/runtime/snd_init.c", source="extern/musyx/snd_init.c"),
-            Object(Matching, "musyx/runtime/snd_math.c", source="extern/musyx/snd_math.c"),
-            Object(NonMatching, "musyx/runtime/snd_midictrl.c", source="extern/musyx/snd_midictrl.c"),
-            Object(Matching, "musyx/runtime/snd_service.c", source="extern/musyx/snd_service.c"),
-            Object(Matching, "musyx/runtime/hardware.c", source="extern/musyx/hardware.c"),
-            Object(Matching, "musyx/runtime/hw_aramdma.c", source="extern/musyx/hw_aramdma.c"),
-            Object(Matching, "musyx/runtime/dsp_import.c", source="extern/musyx/dsp_import.c"),
-            Object(Matching, "musyx/runtime/hw_dolphin.c", source="extern/musyx/hw_dolphin.c"),
-            Object(Matching, "musyx/runtime/hw_memory.c", source="extern/musyx/hw_memory.c"),
-            Object(Matching, "musyx/runtime/hw_lib_dummy.c", source="extern/musyx/hw_lib_dummy.c"),
-            Object(Matching, "musyx/runtime/CheapReverb/creverb_fx.c", source="extern/musyx/creverb_fx.c"),
-            Object(Matching, "musyx/runtime/CheapReverb/creverb.c", source="extern/musyx/creverb.c"),
-            Object(Matching, "musyx/runtime/StdReverb/reverb_fx.c", source="extern/musyx/reverb_fx.c"),
-            Object(Matching, "musyx/runtime/StdReverb/reverb.c", source="extern/musyx/reverb.c"),
-            Object(Matching, "musyx/runtime/Delay/delay_fx.c", source="extern/musyx/delay_fx.c"),
-            Object(Matching, "musyx/runtime/Chorus/chorus_fx.c", source="extern/musyx/chorus_fx.c"),
-            Object(Matching, "musyx/runtime/profile.c", source="extern/musyx/profile.c"),
+            Object(Matching, "musyx/runtime/seq.c"),
+            Object(Matching, "musyx/runtime/synth.c"),
+            Object(Matching, "musyx/runtime/seq_api.c"),
+            Object(Matching, "musyx/runtime/snd_synthapi.c"),
+            Object(NonMatching, "musyx/runtime/stream.c"),
+            Object(Matching, "musyx/runtime/synthdata.c"),
+            Object(NonMatching, "musyx/runtime/synthmacros.c"),
+            Object(Matching, "musyx/runtime/synthvoice.c"),
+            Object(Matching, "musyx/runtime/synth_ac.c"),
+            Object(Matching, "musyx/runtime/synth_adsr.c"),
+            Object(Matching, "musyx/runtime/synth_vsamples.c"),
+            Object(Matching, "musyx/runtime/synth_dbtab.c"),
+            Object(Matching, "musyx/runtime/s_data.c"),
+            Object(NonMatching, "musyx/runtime/hw_dspctrl.c"),
+            Object(Matching, "musyx/runtime/hw_volconv.c"),
+            Object(Matching, "musyx/runtime/snd3d.c"),
+            Object(Matching, "musyx/runtime/snd_init.c"),
+            Object(Matching, "musyx/runtime/snd_math.c"),
+            Object(NonMatching, "musyx/runtime/snd_midictrl.c"),
+            Object(Matching, "musyx/runtime/snd_service.c"),
+            Object(Matching, "musyx/runtime/hardware.c"),
+            Object(Matching, "musyx/runtime/hw_aramdma.c"),
+            Object(Matching, "musyx/runtime/dsp_import.c"),
+            Object(Matching, "musyx/runtime/hw_dolphin.c"),
+            Object(Matching, "musyx/runtime/hw_memory.c"),
+            Object(Matching, "musyx/runtime/hw_lib_dummy.c"),
+            Object(Matching, "musyx/runtime/CheapReverb/creverb_fx.c"),
+            Object(Matching, "musyx/runtime/CheapReverb/creverb.c"),
+            Object(Matching, "musyx/runtime/StdReverb/reverb_fx.c"),
+            Object(Matching, "musyx/runtime/StdReverb/reverb.c"),
+            Object(Matching, "musyx/runtime/Delay/delay_fx.c"),
+            Object(Matching, "musyx/runtime/Chorus/chorus_fx.c"),
+            Object(Matching, "musyx/runtime/profile.c"),
         ],
     ),
     {
@@ -1238,6 +1242,7 @@ config.libs = [
             "-D_DEBUG=1",
             "-enum int",
         ],
+        "extern": True,
         "host": False,
         "objects": [
             Object(NonMatching, "musyx/txwin/txwin.c"),
diff --git a/extern/musyx b/extern/musyx
index 6f76370d..28424c82 160000
--- a/extern/musyx
+++ b/extern/musyx
@@ -1 +1 @@
-Subproject commit 6f76370d3614c260b43cbd6cc875ac9de885359d
+Subproject commit 28424c828c8c462e26953ded3b08e6f3a0c8e489
diff --git a/tools/project.py b/tools/project.py
index dc16e332..d3dabb95 100644
--- a/tools/project.py
+++ b/tools/project.py
@@ -511,7 +511,11 @@ def generate_build_ninja(config, build_config):
             options = obj.options
             completed = obj.completed
 
-            unit_src_path = config.src_dir / options["source"]
+            if "extern" in lib.keys() and lib["extern"]:
+                unit_src_path = Path(lib["extern_source"]) / options["source"]
+            else:
+                unit_src_path = config.src_dir / options["source"]
+
             if not unit_src_path.exists():
                 if config.warn_missing_source:
                     print(f"Missing source file {unit_src_path}")
@@ -828,7 +832,11 @@ def generate_objdiff_config(config, build_config):
             return
 
         lib, obj = result
-        unit_src_path = config.src_dir / obj.options["source"]
+        if "extern" in lib.keys() and lib["extern"]:
+            unit_src_path = Path(lib["extern_source"]) / obj.options["source"]
+        else:
+            unit_src_path = config.src_dir / obj.options["source"]
+        print(unit_src_path)
         if not unit_src_path.exists():
             objdiff_config["units"].append(unit_config)
             return