diff --git a/cutekit/builder.py b/cutekit/builder.py
index e5516f0..a4b357e 100644
--- a/cutekit/builder.py
+++ b/cutekit/builder.py
@@ -5,7 +5,7 @@
 
 from pathlib import Path
 import platform
-from typing import Callable, Literal, TextIO, Union
+from typing import Callable, cast, Literal, TextIO, Union
 
 from . import cli, shell, rules, model, ninja, const
 
@@ -323,6 +323,22 @@ def _(args: CxxDyndepArgs):
             print()
 
 
+# MARK: Port ------------------------------------------------------------------
+
+@cli.command("tools/port", "Execute and build port")
+def _(args: model.PortArgs):
+    registry = model.Registry.use(args)
+    scope = model.PortScope.use(args)
+
+    target = registry.lookup(args.target, model.Target)
+    assert target is not None, f"Target {args.target} not found."
+
+    scope.component.fetch()
+    scope.component.prepare(scope)
+    scope.component.build(scope)
+    scope.component.package(scope)
+
+
 def compileSrcs(
     w: ninja.Writer | None, scope: ComponentScope, rule: rules.Rule, srcs: list[str]
 ) -> list[str]:
@@ -384,12 +400,12 @@ def compileSrcs(
 def compileObjs(
     w: ninja.Writer | None, scope: ComponentScope
 ) -> tuple[list[str], list[str]]:
-    objs = []
-    ddi = []
+    objs: list[str] = []
+    ddi: list[str] = []
     for rule in rules.rules.values():
         if rule.id == "cxx-scan":
             ddi += compileSrcs(w, scope, rule, srcs=scope.wilcard(rule.fileIn))
-        elif rule.id not in ["cp", "ld", "ar", "cxx-collect", "cxx-modmap"]:
+        elif rule.id not in ["cp", "ld", "ar", "cxx-collect", "cxx-modmap", "ck-port"]:
             objs += compileSrcs(w, scope, rule, srcs=scope.wilcard(rule.fileIn))
     return objs, ddi
 
@@ -440,7 +456,9 @@ def outfile(scope: ComponentScope) -> str:
         staticExt = "a"
         exeExt = "out"
 
-    if scope.component.type == model.Kind.LIB:
+    if scope.component.type == model.Kind.LIB or \
+        (scope.component.type == model.Kind.PORT and \
+         cast(model.Port, scope.component).subtype == model.Kind.LIB):
         if scope.component.props.get("shared", False):
             return str(scope.buildpath(f"__lib__/{scope.component.id}.{sharedExt}"))
         else:
@@ -459,7 +477,8 @@ def collectLibs(
 
         if r == scope.component.id:
             continue
-        if not req.type == model.Kind.LIB:
+        if req.type != model.Kind.LIB and \
+            (not (isinstance(req, model.Port) and req.subtype == model.Kind.LIB)):
             raise RuntimeError(f"Component {r} is not a library")
         res.append(outfile(scope.openComponentScope(req)))
 
@@ -474,7 +493,8 @@ def collectInjectedObjs(scope: ComponentScope) -> list[str]:
 
         if r == scope.component.id:
             continue
-        if not req.type == model.Kind.LIB:
+        if req.type != model.Kind.LIB and \
+            (not (isinstance(req, model.Port) and req.subtype == model.Kind.LIB)):
             raise RuntimeError(f"Component {r} is not a library")
 
         objs, _ = compileObjs(None, scope.openComponentScope(req))
@@ -521,7 +541,7 @@ def link(
                     "ck_component": scope.component.id,
                 },
             )
-    else:
+    elif scope.component.type == model.Kind.EXE:
         injectedObjs = collectInjectedObjs(scope)
         libs = collectLibs(scope)
         w.build(
@@ -536,6 +556,16 @@ def link(
             },
             implicit=res,
         )
+    else:
+        w.build(
+            out,
+            "ck-port",
+            [],
+            variables={
+                "ck_target": scope.target.id,
+                "ck_component": scope.component.id,
+            }
+        )
     return out, ddi
 
 
@@ -545,10 +575,14 @@ def link(
 def all(w: ninja.Writer, scope: TargetScope) -> list[str]:
     all: list[str] = []
     ddis: list[str] = []
+    ports: list[str] = []
     for c in scope.registry.iterEnabled(scope.target):
         out, ddi = link(w, scope.openComponentScope(c))
         ddis.extend(ddi)
-        all.append(out)
+        if c.type == model.Kind.PORT:
+            ports.append(out)
+        else:
+            all.append(out)
 
     modulesDdi = str(scope.buildpath("modules.ddi"))
     w.build(modulesDdi, "cxx-collect", ddis)
@@ -565,6 +599,7 @@ def all(w: ninja.Writer, scope: TargetScope) -> list[str]:
 
     all = [modulesDd] + all
 
+    w.build("ports", "phony", ports)
     w.build("all", "phony", all)
     w.default("all")
     return all
@@ -647,10 +682,14 @@ def build(
         if not r.enabled:
             raise RuntimeError(f"Component {c.id} is disabled: {r.reason}")
 
-        products.append(s.openProductScope(Path(outfile(scope.openComponentScope(c)))))
+        product = s.openProductScope(Path(outfile(scope.openComponentScope(c))))
+        products.append(product)
 
     outs = list(map(lambda p: str(p.path), products))
 
+    # Build ports first
+    shell.popen("ninja", "-f", ninjaPath, "ports")
+
     ninjaCmd = [
         "ninja",
         "-f",
diff --git a/cutekit/model.py b/cutekit/model.py
index e39e21e..17f5afa 100644
--- a/cutekit/model.py
+++ b/cutekit/model.py
@@ -28,6 +28,7 @@ class Kind(StrEnum):
     TARGET = "target"
     LIB = "lib"
     EXE = "exe"
+    PORT = "port"
 
 
 # MARK: Manifest ---------------------------------------------------------------
@@ -586,34 +587,6 @@ def use() -> "Project":
         return _project
 
 
-@cli.command("model", "Manage the model")
-def _():
-    """
-    Manage the CuteKit model.
-    """
-    pass
-
-
-class InstallArgs:
-    """
-    Arguments for the install command.
-    """
-
-    update: bool = cli.arg(
-        None, "update", "Pull latest versions of externs and refresh the lockfile"
-    )
-
-
-@cli.command("install", "Install required external packages")
-def _(args: InstallArgs):
-    """
-    Install required external packages for the project.
-    """
-    project = Project.use()
-    assert project.lockfile is not None
-    project.fetchExterns(project.lockfile, args.update)
-    project.lockfile.save()
-
 
 # MARK: Target -----------------------------------------------------------------
 
@@ -644,6 +617,7 @@ class Tool(DataClassJsonMixin):
     "cxx-collect": Tool("jq"),
     "cxx-modmap": Tool("ck --safemode tools cxx-modmap"),
     "cxx-dyndep": Tool("ck --safemode tools cxx-dyndep"),
+    "ck-port": Tool("ck --safemode tools port"),
 }
 """Default tools available in all projects."""
 
@@ -835,11 +809,144 @@ def isEnabled(self, target: Target) -> tuple[bool, str]:
         return True, ""
 
 
+# MARK: Port ------------------------------------------------------------------
+
+class PortArgs(TargetArgs):
+    component: str = cli.arg(None, "component", "Name of the component to port")
+    out: str = cli.arg(None, "out", "Output path")
+
+
+@dt.dataclass
+class Port(Component):
+    _subtype: Kind = dt.field(default=Kind.UNKNOWN)
+    ctx: Optional[dict[str, Any]] = dt.field(default=None)
+
+    @property
+    def subtype(self) -> Kind:
+        if self._subtype == Kind.UNKNOWN:
+            self.parseBuild()
+        return self._subtype
+
+    def parseBuild(self):
+        with self.subpath("build.py").open("r") as f:
+            globals: dict[str, Any] = {}
+            code = compile(f.read(), str(f"<PORT {self.id}"), "exec")
+
+        exec(code, globals)
+        del globals['__builtins__']
+
+        self.ctx = globals
+
+        assert 'kind' in self.ctx, "Port context must have a 'kind' field"
+        self._subtype = Kind(self.ctx['kind'])
+
+    def fetch(self):
+        if self.ctx is None:
+            self.parseBuild()
+
+        assert self.ctx is not None
+
+        srcDir = Path(Project.use().dirname()) / const.EXTERN_DIR / self.id
+        if srcDir.exists():
+            _logger.debug(f"Port {self.id} already fetched at {srcDir}")
+            return
+
+        if self.ctx.get('git_url') is not None:
+            print(f"Installing {self.id} from {self.ctx['git_url']}...")
+            _logger.info(f"Cloning {self.ctx['git_url']}...")
+            cmd = [
+                "git",
+                "clone",
+                "--quiet",
+                "--depth=1",
+                self.ctx['git_url'],
+                str(srcDir),
+            ]
+
+            if self.ctx.get('commit') is not None:
+                cmd.append(f"--revision={self.ctx.get('commit')}")
+
+            if self.ctx.get('branch') is not None:
+                cmd.append(f"--branch={self.ctx.get('branch')}")
+
+            shell.exec(*cmd, quiet=True)
+
+    def prepare(self, port: "PortScope"):
+        if self.ctx is None:
+            self.parseBuild()
+
+        assert self.ctx is not None
+
+        if 'patches' in self.ctx:
+            if not (port.srcDir / ".git").exists():
+                raise RuntimeError(f"Port {self.ctx['name']} is not a git repository, cannot apply patches.")
+
+            for patch in self.ctx['patches']:
+                try:
+                    shell.exec(
+                        *["git", "-C", str(port.srcDir), "apply", "--check", str(port.cwd / patch)],
+                        quiet=True
+                    )
+                    shell.exec(*["git", "-C", str(port.srcDir), "apply", str(port.cwd / patch)])
+                except Exception as e:
+                    _logger.warning(f"Could not apply patch {patch} to port {self.ctx['name']}: {e}")
+
+        if 'prepare' in self.ctx:
+            self.ctx['prepare'](port)
+
+    def build(self, port: "PortScope"):
+        assert self.ctx is not None
+
+        if 'build' in self.ctx:
+            self.ctx['build'](port)
+
+    def package(self, port: "PortScope"):
+        assert self.ctx is not None
+
+        if 'package' in self.ctx:
+            self.ctx['package'](port)
+
+        if not port.destFile.exists():
+            with open(port.destFile, "w") as f:
+                f.write("")
+
+
+@dt.dataclass
+class PortScope:
+    srcDir: Path
+    destDir: Path
+    destFile: Path
+    cwd: Path
+    target: Target
+    component: Port
+    includeDir: Path
+
+    @staticmethod
+    def use(args: PortArgs) -> "PortScope":
+        registry = Registry.use(args)
+        component = registry.ensure(args.component, Port)
+
+        assert isinstance(component, Port), "Component is not a Port"
+
+        return PortScope(
+            srcDir=Path(const.EXTERN_DIR) / args.component,
+            destDir=Path(args.out).parent,
+            destFile=Path(args.out),
+            cwd=Path(component.dirname()),
+            target=Target.use(args),
+            component=component,
+
+            #FIXME: this is a temporary hack for includes
+            includeDir=Path(const.GENERATED_DIR) / args.component
+        )
+
+
 KINDS: dict[Kind, Type[Manifest]] = {
     Kind.PROJECT: Project,
     Kind.TARGET: Target,
     Kind.LIB: Component,
     Kind.EXE: Component,
+    Kind.PORT: Port,
 }
 """Mapping of manifest kinds to their corresponding classes."""
 
@@ -1298,6 +1405,35 @@ def load(project: Project, mixins: list[str], props: Props) -> "Registry":
         return r
 
 
+@cli.command("model", "Manage the model")
+def _():
+    """
+    Manage the CuteKit model.
+    """
+    pass
+
+
+class InstallArgs(RegistryArgs):
+    """
+    Arguments for the install command.
+    """
+
+    update: bool = cli.arg(
+        None, "update", "Pull latest versions of externs and refresh the lockfile"
+    )
+
+
+@cli.command("install", "Install required external packages")
+def _(args: InstallArgs):
+    """
+    Install required external packages for the project.
+    """
+    project = Project.use()
+    assert project.lockfile is not None
+    project.fetchExterns(project.lockfile, args.update)
+    project.lockfile.save()
+
+
 @cli.command("model/list", "List all components and targets")
 def _(args: TargetArgs):
     """
diff --git a/cutekit/project.py b/cutekit/project.py
index 39bbc3c..e8ae559 100644
--- a/cutekit/project.py
+++ b/cutekit/project.py
@@ -35,20 +35,20 @@ def init_manifest(args: InitArgs):
     """ Each type of kind """
     match model.KINDS[args.kind]:
         # Init a Component or a Target
-        case model.Component | model.Target:
+        case model.Component | model.Target | model.Port:
             if project is None:
                 raise RuntimeError(
                     f"can't create '{args.kind}' without a project")
 
             filename = "manifest"
-            if model.KINDS[args.kind] == model.Component:
+            if model.KINDS[args.kind] in [model.Component, model.Port]:
                 schema = model.COMPONENT_SCHEMA
                 manifest = model.Component(
                     **manifest.__dict__
                 )
                 if args.description:
                     manifest.description = args.description
-            else:
+            elif model.KINDS[args.kind] == model.Target:
                 schema = model.TARGET_SCHEMA
                 manifest = model.Target(
                     **manifest.__dict__
@@ -89,11 +89,23 @@ def init_manifest(args: InitArgs):
 
             if args.description:
                 manifest.description = args.description
+        case _:
+            raise RuntimeError(f"Unknown kind: {args.kind}")
 
     # Avoid having manifests in different format
     if model.Manifest.tryLoad(Path.cwd() / filename):
         raise RuntimeError("Your Manifest already exist.")
 
+    if model.KINDS[args.kind] == model.Port:
+        with open("build.py", "w", encoding="utf-8") as f:
+            f.writelines([
+                "import cutekit as ck\n\n",
+                "kind = \"lib\"",
+                "def prepare(scope: ck.model.PortScope):\n    ...\n\n"
+                "def build(scope: ck.model.PortScope):\n    ...\n\n",
+                "def package(scope: ck.model.PortScope):\n    ...\n"
+            ])
+
     filename += f".{args.format}"
     try:
         # Filter empty variable, and protected variables from Manifest.
diff --git a/cutekit/rules.py b/cutekit/rules.py
index 1b6c785..7cb38c2 100644
--- a/cutekit/rules.py
+++ b/cutekit/rules.py
@@ -15,6 +15,7 @@ class Rule:
 
 rules: dict[str, Rule] = {
     "cp": Rule("cp", ["*"], "*", "$in $out"),
+    "ck-port": Rule("ck-port", ["*"], "*", "--component=$ck_component --out=$out --target=$ck_target"),
     "cc": Rule(
         "cc",
         ["*.c"],