diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..72e8ffc
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1 @@
+*
diff --git a/.gitignore b/.gitignore
index 7dca835..8e32da8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-/dist/
+/build/
 .sconsign.dblite
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..6414dec
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,12 @@
+FROM debian:bookworm
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+    && apt-get install -y \
+        clang \
+        llvm \
+        scons
+
+RUN useradd rt
+USER rt
diff --git a/SConscript b/SConscript
deleted file mode 100644
index 4cd423c..0000000
--- a/SConscript
+++ /dev/null
@@ -1,64 +0,0 @@
-import os
-import sys
-
-llvm_flags = [
-        "-g",
-        "-Os",
-        "-ffunction-sections",
-        "-fdata-sections",
-        "-flto",
-    ]
-
-env = Environment(
-    CPPPATH=["include"],
-    CCFLAGS=llvm_flags,
-    CFLAGS=["-std=c99"],
-    LINKFLAGS=llvm_flags,
-)
-
-# for color terminal output when available
-if "TERM" in os.environ:
-    env["ENV"]["TERM"] = os.environ["TERM"]
-
-if "darwin" in sys.platform:
-    env["CC"] = "clang"
-    env.Append(
-        CCFLAGS=[
-            "-Weverything",
-            "-Werror",
-            "-Wno-padded",
-            "-Wno-poison-system-directories",
-        ],
-        LINKFLAGS=["-dead_strip"],
-    )
-elif "linux" in sys.platform:
-    env["CC"] = "gcc"
-    env.Append(CPPDEFINES=[("_POSIX_C_SOURCE", "200809L")])
-    env.Append(LINKFLAGS=["-Wl,--gc-sections"])
-
-librt = env.StaticLibrary(
-    target="rt",
-    source=[
-        "src/rt.c",
-        "src/tick.c",
-        "src/critical.c",
-        "src/delay.c",
-        "src/queue.c",
-        "src/sem.c",
-    ],
-)
-
-posix_env = env.Clone()
-posix_env.Append(
-    CCFLAGS="-pthread",
-    LINKFLAGS="-pthread",
-)
-
-posix_port = posix_env.Object("src/port/posix.c")
-
-posix_simple = posix_env.Object(target="posix_simple", source="examples/simple.c")
-posix_delay = posix_env.Object(target="posix_delay", source="examples/delay.c")
-posix_queue = posix_env.Object(target="posix_queue", source="examples/queue.c")
-posix_env.Program([posix_simple, librt, posix_port])
-posix_env.Program([posix_delay, librt, posix_port])
-posix_env.Program([posix_queue, librt, posix_port])
diff --git a/SConstruct b/SConstruct
index 231b0c2..6a2bbb5 100644
--- a/SConstruct
+++ b/SConstruct
@@ -1,5 +1,66 @@
-SConscript(
-    dirs=".",
-    variant_dir="dist",
-    duplicate=False,
+import os
+import sys
+
+llvm_flags = [
+    "-g",
+    "-Os",
+    "-ffunction-sections",
+    "-fdata-sections",
+    "-flto",
+]
+
+env = Environment(
+    CPPPATH=[Dir("include").srcnode()],
+    CCFLAGS=llvm_flags,
+    CFLAGS=["-std=c99"],
+    LINKFLAGS=llvm_flags,
+)
+
+# for color terminal output when available
+if "TERM" in os.environ:
+    env["ENV"]["TERM"] = os.environ["TERM"]
+
+env["CC"] = "clang"
+env.Append(
+    CCFLAGS=[
+        "-Weverything",
+        "-Werror",
+        "-Wno-padded",
+        "-Wno-poison-system-directories",
+        "-Wno-declaration-after-statement",
+        "-Wno-disabled-macro-expansion",
+    ],
+)
+
+if "darwin" in sys.platform:
+    env.Append(
+        LINKFLAGS=["-dead_strip"],
+    )
+elif "linux" in sys.platform:
+    env.Append(
+        CPPDEFINES={"_POSIX_C_SOURCE": "200809L"}, LINKFLAGS=["-Wl,--gc-sections"]
+    )
+
+librt = SConscript(
+    dirs="src", variant_dir="build/lib", duplicate=False, exports=["env"]
+)
+
+posix_env = env.Clone()
+posix_env.Append(
+    CCFLAGS="-pthread",
+    LINKFLAGS="-pthread",
+)
+
+libposix = SConscript(
+    "arch/posix/SConscript",
+    variant_dir="build/lib/posix",
+    duplicate=False,
+    exports={"env": posix_env},
+)
+
+example_env = posix_env.Clone()
+example_env.Append(LIBS=[librt, libposix])
+
+SConscript(
+    dirs="examples", variant_dir="build", duplicate=False, exports={"env": example_env}
 )
diff --git a/arch/posix/SConscript b/arch/posix/SConscript
new file mode 100644
index 0000000..df004a6
--- /dev/null
+++ b/arch/posix/SConscript
@@ -0,0 +1,5 @@
+Import("env")
+
+libposix = env.StaticLibrary("posix.c")
+
+Return("libposix")
diff --git a/src/port/posix.c b/arch/posix/posix.c
similarity index 100%
rename from src/port/posix.c
rename to arch/posix/posix.c
diff --git a/docker.bash b/docker.bash
new file mode 100755
index 0000000..c1e1c78
--- /dev/null
+++ b/docker.bash
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -xe
+
+name="rt"
+image="$name-builder"
+
+docker build --tag "$image" .
+
+workdir="/home/$name/$name"
+
+docker run \
+  --rm \
+  --tty \
+  --interactive \
+  --volume "$(pwd):$workdir" \
+  --workdir "$workdir" \
+  --cap-add SYS_PTRACE \
+  "$image"
diff --git a/examples/SConscript b/examples/SConscript
new file mode 100644
index 0000000..2358e0a
--- /dev/null
+++ b/examples/SConscript
@@ -0,0 +1,5 @@
+Import("env")
+
+env.Program("simple.c")
+env.Program("delay.c")
+env.Program("queue.c")
diff --git a/src/SConscript b/src/SConscript
new file mode 100644
index 0000000..239e30e
--- /dev/null
+++ b/src/SConscript
@@ -0,0 +1,15 @@
+Import("env")
+
+librt = env.StaticLibrary(
+    target="rt",
+    source=[
+        "rt.c",
+        "tick.c",
+        "critical.c",
+        "delay.c",
+        "queue.c",
+        "sem.c",
+    ],
+)
+
+Return("librt")
diff --git a/src/tick.c b/src/tick.c
index 729f7da..fad5d53 100644
--- a/src/tick.c
+++ b/src/tick.c
@@ -9,7 +9,7 @@ static rt_tick_t rt_ticks;
 void rt_tick(void)
 {
     ++rt_ticks;
-#if RT_LOG
+#ifdef RT_LOG
     printf("tick %lu\n", rt_ticks);
     fflush(stdout);
 #endif