diff --git a/chinook/management/_load.py b/chinook/management/_load.py
index c22a687..d9e3a9f 100644
--- a/chinook/management/_load.py
+++ b/chinook/management/_load.py
@@ -41,6 +41,8 @@ def load(path: Path) -> Project:
 		raise rethrowme
 
 def _collect_profiles(project: Project) -> None:
+	assert False, "Not Implemented Yet"
+
 	# TODO: Determine what profile is supposed to be active and load the targets
 	#       so that they will be compiled.
 	for profile in project.profiles:
@@ -115,11 +117,11 @@ def _clone_required(
 	reqpath:  Path
 ) -> None:
 	# TODO: Clean this up.
-	def handle_success(cmdstr: str, stdout: str, stderr: str) -> None:
+	def handle_success(retcode: int, cmdstr: str, stdout: str) -> None:
 		return
 
 	errstr = None
-	def handle_error(cmdstr: str, stdout: str, stderr: str) -> None:
+	def handle_error(retcode: int, cmdstr: str, stderr: str) -> None:
 		global errstr
 		errstr = stderr
 
diff --git a/chinook/models/_project.py b/chinook/models/_project.py
index 5d30ce7..4a72de7 100644
--- a/chinook/models/_project.py
+++ b/chinook/models/_project.py
@@ -25,8 +25,8 @@ class Project(Identity):
 	tests:    list[Target]     = field(default_factory=list)
 	exports:  list[str]        = field(default_factory=list)
 
-	origination: Origination  = field(default=Origination.cwd())
-	destination: Destination  = field(default=Destination.cwd())
+	origination: Origination = field(default=Origination.cwd())
+	destination: Destination = field(default=Destination.cwd())
 
 	@classmethod
 	def to_dict(cls, data: Self) -> dict:
diff --git a/chinook/models/_target.py b/chinook/models/_target.py
index a044280..cdd2f6c 100644
--- a/chinook/models/_target.py
+++ b/chinook/models/_target.py
@@ -27,6 +27,9 @@ class Target(yaml.YAMLObject):
 	libs: set[Accessor] = field(default_factory=set)
 	srcs: set[Accessor] = field(default_factory=set)
 
+	# Internal to the tool.
+	_prepared: bool = field(init=False,default=False)
+
 	@classmethod
 	def to_dict(cls, data: Self) -> dict:
 		return {
diff --git a/chinook/pipeline/_build.py b/chinook/pipeline/_build.py
index 684c07f..86f8771 100644
--- a/chinook/pipeline/_build.py
+++ b/chinook/pipeline/_build.py
@@ -22,5 +22,24 @@ def build(
 
 	commands: list[Command] = []
 	for target in project.targets:
+		commands.extend(_prepare_dependencies(appcfg, target, logger))
 		commands.extend(prepare(appcfg, project, target, logger))
 	return execute(commands, "Building")
+
+def _prepare_dependencies(
+	appcfg: Config,
+	target: Target,
+	logger: Logger = _logger
+) -> list[Command]:
+	from ..management import find_target_by_name
+	from ..management import find_project_by_target
+
+	commands: list[Command] = []
+
+	for required in target.deps:
+		dependency = find_target_by_name(required)
+		if dependency._prepared:
+			continue
+		project = find_project_by_target(required)
+		commands.extend(prepare(appcfg, project, target, logger))
+	return commands
diff --git a/chinook/pipeline/_prepare.py b/chinook/pipeline/_prepare.py
index 07ae2f5..1c26252 100644
--- a/chinook/pipeline/_prepare.py
+++ b/chinook/pipeline/_prepare.py
@@ -26,10 +26,19 @@ def prepare(
 	target:  Target,
 	logger:  Logger = _logger
 ) -> list[Command]:
-	objects:  list[Path]    = []
 	commands: list[Command] = []
+	if target.type == Output.IMP or \
+		 target.type == Output.INT:
+		return commands
+
+	match target.type:
+		case Output.EXE: outfile = project.destination.bin(target.name)
+		case Output.LIB: outfile = project.destination.lib(target.name)
+		case Output.DLL: outfile = project.destination.dll(target.name)
+		case Output.OBJ: assert False, "Not Implemented"
+
+	objects: list[Path] = []
 
-	# TODO: clean this up.
 	compiler = Compiler(appcfg.native_tooling, logger)
 	defopts  = CompilerOptions()
 
@@ -40,10 +49,10 @@ def prepare(
 	for file in target.srcs:
 		srcfile = project.origination.src(file.value)
 		dstfile = project.destination.obj(file.value)
-		if latest(srcfile, dstfile):
-			continue
-		commands.append(CompileObject(compiler, defopts, logger, srcfile, dstfile))
-		objects.append(dstfile)
+		if not latest(srcfile, dstfile):
+			commands.append(CompileObject(compiler, defopts, logger, srcfile, dstfile))
+		if not latest(srcfile, outfile):
+			objects.append(dstfile)
 
 	defopts.objfiles.update(objects)
 	del objects
@@ -65,16 +74,11 @@ def prepare(
 
 	command: Command
 	match target.type:
-		case Output.EXE:
-			outfile = project.destination.bin(target.name)
-			command = CompileProgram(compiler, defopts, logger, outfile)
-		case Output.LIB:
-			outfile = project.destination.lib(target.name)
-			command = CompileArchive(compiler, defopts, logger, outfile)
-		case Output.DLL:
-			outfile = project.destination.dll(target.name)
-			command = CompileDynlib(compiler, defopts, logger, outfile)
-		case Output.OBJ:
-			assert False, "Not Implemented"
+		case Output.EXE: command = CompileProgram(compiler, defopts, logger, outfile)
+		case Output.LIB: command = CompileArchive(compiler, defopts, logger, outfile)
+		case Output.DLL: command = CompileDynlib(compiler, defopts, logger, outfile)
+		case Output.OBJ: assert False, "Not Implemented"
+
+	target._prepared = True
 	commands.append(command)
 	return commands
diff --git a/chinook/pipeline/_test.py b/chinook/pipeline/_test.py
index 21bf0e9..87a6383 100644
--- a/chinook/pipeline/_test.py
+++ b/chinook/pipeline/_test.py
@@ -23,6 +23,7 @@ def test(
 
 	commands: list[Command] = []
 	for target in project.tests:
+		commands.extend(_prepare_dependencies(appcfg, target, logger))
 		commands.extend(prepare(appcfg, project, target, logger))
 	results = execute(commands, "Building")
 
@@ -32,3 +33,21 @@ def test(
 		commands.append(ExecuteTest(None, None, logger, testfile))
 	results.extend(execute(commands, "Testing"))
 	return results
+
+def _prepare_dependencies(
+	appcfg: Config,
+	target: Target,
+	logger: Logger = _logger
+) -> list[Command]:
+	from ..management import find_target_by_name
+	from ..management import find_project_by_target
+
+	commands: list[Command] = []
+
+	for required in target.deps:
+		dependency = find_target_by_name(required)
+		if dependency._prepared:
+			continue
+		project = find_project_by_target(required)
+		commands.extend(prepare(appcfg, project, target, logger))
+	return commands