diff --git a/.gitignore b/.gitignore
index 6775093..637300e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -75,4 +75,7 @@ bin/*
 *.translation
 !game/common/map/*.obj
 
-/compile_commands.json
\ No newline at end of file
+/compile_commands.json
+
+# Out-of-source build directory
+build/
\ No newline at end of file
diff --git a/SConstruct b/SConstruct
index 9374a28..f39d294 100644
--- a/SConstruct
+++ b/SConstruct
@@ -19,6 +19,26 @@ opts.Add(BoolVariable("build_lvdf_headless", "Build the lexy vdf headless execut
 
 env.FinalizeOptions()
 
+suffix = ".{}.{}".format(env["platform"], env["target"])
+if env.dev_build:
+    suffix += ".dev"
+if env["precision"] == "double":
+    suffix += ".double"
+suffix += "." + env["arch"]
+if env["platform"] == "windows":
+    if env.get("debug_crt", False):
+        suffix += ".mdd"
+    elif env.get("use_static_cpp", False):
+        suffix += ".mt"
+    else:
+        suffix += ".md"
+if env.get("use_asan", False):
+    suffix += ".san"
+env["suffix"] = suffix
+
+build_dir = env.Dir("build/" + suffix.lstrip(".")).abspath.replace("\\", "/")
+env["build_dir"] = build_dir
+
 SConscript("deps/SCsub", "env")
 
 env.lexy_vdf = {}
@@ -34,20 +54,15 @@ env.lexy_vdf = {}
 # tweak this if you want to use different folders, or more folders, to store your source code in.
 source_path = "src/lexy-vdf"
 include_path = "include"
-env.Append(CPPPATH=[[env.Dir(p) for p in [source_path, include_path]]])
-sources = env.GlobRecursive("*.cpp", [source_path])
+# Mirror the lexy-vdf source tree into the per-config build dir.
+lexyvdf_variant = build_dir + "/" + source_path
+env.VariantDir(lexyvdf_variant, source_path, duplicate=True)
+# Variant-only CPPPATH for source_path; include_path stays source-side as the
+# public API root.
+env.Append(CPPPATH=[[env.Dir(p) for p in [include_path, lexyvdf_variant]]])
+sources = env.GlobRecursive("*.cpp", [lexyvdf_variant])
 env.lexy_vdf_sources = sources
 
-suffix = ".{}.{}".format(env["platform"], env["target"])
-if env.dev_build:
-    suffix += ".dev"
-if env["precision"] == "double":
-    suffix += ".double"
-suffix += "." + env["arch"]
-
-# Expose it when included from another project
-env["suffix"] = suffix
-
 library = None
 env["OBJSUFFIX"] = suffix + env["OBJSUFFIX"]
 library_name = "liblexy-vdf{}{}".format(suffix, env["LIBSUFFIX"])
@@ -71,10 +86,12 @@ env["PROGSUFFIX"] = suffix + env["PROGSUFFIX"]
 if env["build_lvdf_headless"]:
     headless_name = "lexy-vdf"
     headless_env = env.Clone()
-    headless_path = ["src/headless"]
+    headless_src = "src/headless"
+    headless_variant = build_dir + "/" + headless_src
+    headless_env.VariantDir(headless_variant, headless_src, duplicate=True)
     headless_env.Append(CPPDEFINES=["LEXY_VDF_HEADLESS"])
-    headless_env.Append(CPPPATH=[headless_env.Dir(headless_path)])
-    headless_env.headless_sources = env.GlobRecursive("*.cpp", headless_path)
+    headless_env.Append(CPPPATH=[headless_env.Dir(headless_variant)])
+    headless_env.headless_sources = env.GlobRecursive("*.cpp", [headless_variant])
     if not env["build_lvdf_library"]:
         headless_env.headless_sources += sources
     headless_program = headless_env.Program(
diff --git a/deps/SCsub b/deps/SCsub
index eb27dab..ac377c2 100644
--- a/deps/SCsub
+++ b/deps/SCsub
@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 
+import os
+
 Import("env")
 
 def build_lexy(env):
@@ -26,10 +28,14 @@ def build_lexy(env):
 
     paths = ["lexy/include", "lexy/src"]
     lexy_env.Append(CPPPATH=[[lexy_env.Dir(p) for p in paths]])
-    sources = env.GlobRecursive("*.cpp", paths)
+    # Mirror lexy's source tree into the per-config build dir.
+    build_root = (env.get("build_dir") or env.Dir("#").abspath).replace("\\", "/")
+    lexy_out = build_root + "/lexy/lexy/src"
+    lexy_env.VariantDir(lexy_out, "lexy/src", duplicate=True)
+    sources = env.GlobRecursive("*.cpp", [lexy_out])
     env.lexy_sources = sources
-    library_name = "liblexy_file" + env["LIBSUFFIX"]
-    library = lexy_env.StaticLibrary(target="lexy/src/" + library_name, source=sources)
+    library_name = "liblexy_file" + env.get("suffix", "") + env["LIBSUFFIX"]
+    library = lexy_env.StaticLibrary(target=lexy_out + "/" + library_name, source=sources)
     Default(library)
 
     env.Append(CPPPATH=[lexy_env.Dir("lexy/include")])
@@ -38,7 +44,7 @@ def build_lexy(env):
     else:
         env.Append(CXXFLAGS=["-isystem", lexy_env.Dir("lexy/include")])
     env.Append(CXXFLAGS=[""])
-    env.Append(LIBPATH=[lexy_env.Dir("lexy/src")])
+    env.Append(LIBPATH=[lexy_env.Dir(lexy_out)])
     env.Prepend(LIBS=[library_name])
 
 
diff --git a/scripts b/scripts
index 4ddc9a1..d8f908c 160000
--- a/scripts
+++ b/scripts
@@ -1 +1 @@
-Subproject commit 4ddc9a1b9b14fddab397325a1d016de56d465d75
+Subproject commit d8f908cb2d7b4a4564d12f71cbfe97bed241195f