diff --git a/.gitignore b/.gitignore
index 378eac2..cb330d7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
 build
+compile_commands.json
+# scons cruft
+.cache
+.sconsign.dblite
diff --git a/Makefile b/Makefile
deleted file mode 100644
index f8a0c88..0000000
--- a/Makefile
+++ /dev/null
@@ -1,41 +0,0 @@
-TARGET_EXEC ?= nihilipsm
-
-BUILD_DIR ?= ./build
-SRC_DIRS ?= ./src
-
-SRCS := $(shell find $(SRC_DIRS) -name *.cpp -or -name *.c -or -name *.s)
-OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
-DEPS := $(OBJS:.o=.d)
-
-INC_DIRS := $(shell find $(SRC_DIRS) -type d)
-INC_FLAGS := $(addprefix -I,$(INC_DIRS))
-
-CPPFLAGS ?= $(INC_FLAGS) -MMD -MP
-
-$(BUILD_DIR)/$(TARGET_EXEC): $(OBJS)
-	$(CC) $(OBJS) -o $@ $(LDFLAGS)
-
-# assembly
-$(BUILD_DIR)/%.s.o: %.s
-	$(MKDIR_P) $(dir $@)
-	$(AS) $(ASFLAGS) -c $< -o $@
-
-# c source
-$(BUILD_DIR)/%.c.o: %.c
-	$(MKDIR_P) $(dir $@)
-	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@
-
-# c++ source
-$(BUILD_DIR)/%.cpp.o: %.cpp
-	$(MKDIR_P) $(dir $@)
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
-
-
-.PHONY: clean
-
-clean:
-	$(RM) -r $(BUILD_DIR)
-
--include $(DEPS)
-
-MKDIR_P ?= mkdir -p
diff --git a/SConstruct b/SConstruct
new file mode 100644
index 0000000..3f08374
--- /dev/null
+++ b/SConstruct
@@ -0,0 +1,63 @@
+from pathlib import Path
+
+#
+# File lists
+#
+
+build_dir = "build/default/"
+src_dir = "src/"
+
+program_sources = ["src/main.c"]
+lib_srcs = []
+lib_includes = ["src/"]
+
+test_srcs = [""]
+test_lib_srcs = ["third-party/unity/src/unity.c"]
+test_lib_includes = ["third-party/unity/src/"]
+
+#
+# Construct Environments
+#
+
+VariantDir(build_dir, ".", duplicate=0)
+env = Environment(CPPPATH=lib_includes, COMPILATIONDB_USE_ABSPATH=True)
+env.Tool('compilation_db')
+env.CompilationDatabase()
+
+test_env = env.Clone()
+test_env.Append(CPPPATH=test_lib_includes)
+
+#
+# Construct Environments
+#
+
+# Generate REPL
+
+
+lib_objs = [env.Object(p) for p in lib_srcs]
+env.Program(build_dir + "nihilispm", lib_objs + program_sources)
+
+# Generate unit test executables
+
+test_lib_objs = [
+    test_env.Object(build_dir + p, CPPPATH=lib_includes + test_lib_includes) for p in test_lib_srcs
+]
+test_deps = test_lib_objs + lib_objs
+tests = [test_env.Program(build_dir + p, [p] + test_deps) for p in test_srcs]
+
+#
+# Generate Test Runner script
+#
+
+env.Substfile(
+    "run_tests.sh.in",
+    SUBST_DICT={
+        "@tests@": " ".join(str(Path(str(test[0])).resolve()) for test in tests)
+    },
+)
+
+env.Command(build_dir + "run_tests", "run_tests.sh", Chmod("run_tests.sh", 0o755))
+
+# Copy default build compile commands to root, which is where tools seem to want
+# it.
+Copy("compile_commands.json", build_dir + "compile_commands.json")
diff --git a/run_tests.sh.in b/run_tests.sh.in
new file mode 100755
index 0000000..6ae5cfb
--- /dev/null
+++ b/run_tests.sh.in
@@ -0,0 +1,7 @@
+#!/bin/bash
+TESTS=@tests@
+for test in $TESTS; do
+    echo ===========================
+    echo Test: $test
+    $test
+done
diff --git a/src/main.c b/src/main.c
index f3ed1bd..60b8a17 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 
-int main(const char **argv, int argc) {
-    printf("Hello, world!\n");
+int main(int argc, const char **argv) {
+    (void) argc, (void) argv;
+
     return 0;
 }