diff --git a/portage/BUILD.bazel b/portage/BUILD.bazel
index 2b41148..7d16963 100644
--- a/portage/BUILD.bazel
+++ b/portage/BUILD.bazel
@@ -129,3 +129,15 @@
         ":omit_ebuild_src": "False",
     },
 )
+
+bool_flag(
+    name = "ccache",
+    build_setting_default = False,
+    visibility = ["//visibility:public"],
+)
+
+string_flag(
+    name = "ccache_dir",
+    build_setting_default = "",
+    visibility = ["//visibility:public"],
+)
diff --git a/portage/build_defs/ebuild.bzl b/portage/build_defs/ebuild.bzl
index 79d844f..9175540 100644
--- a/portage/build_defs/ebuild.bzl
+++ b/portage/build_defs/ebuild.bzl
@@ -12,6 +12,9 @@
 load("//bazel/portage/build_defs:package_contents.bzl", "generate_contents")
 load("//bazel/transitions:primordial.bzl", "primordial_transition")
 
+_CCACHE_LABEL = "//bazel/portage:ccache"
+_CCACHE_DIR_LABEL = "//bazel/portage:ccache_dir"
+
 # The stage1 SDK will need to be built with ebuild_primordial.
 # After that, they can use the ebuild rule.
 # This ensures that we don't build the stage1 targets twice.
@@ -190,6 +193,14 @@
         executable = True,
         cfg = "exec",
     ),
+    _ccache = attr.label(
+        default = Label(_CCACHE_LABEL),
+        providers = [BuildSettingInfo],
+    ),
+    _ccache_dir = attr.label(
+        default = Label(_CCACHE_DIR_LABEL),
+        providers = [BuildSettingInfo],
+    ),
 )
 
 def _bashrc_to_path(bashrc):
@@ -328,6 +339,24 @@
         caches_dir = paths.dirname(cache_marker_path)
         args.add("--incremental-cache-dir=%s/portage" % caches_dir)
 
+    # --ccache-dir
+    ccache_dir = ctx.attr._ccache_dir[BuildSettingInfo].value
+    if ccache_dir:
+        if not ccache_dir.startswith("/"):
+            fail("%s=%r is not an absolute path" % (_CCACHE_DIR_LABEL, ccache_dir))
+
+        # Always pass --ccache-dir regardless of --ccache.
+        # So people can also enable ccache with the ebuld_debug script,
+        # without worrying about the ccache directory.
+        args.add(ccache_dir, format = "--ccache-dir=%s")
+
+    # --ccache
+    ccache = ctx.attr._ccache[BuildSettingInfo].value
+    if ccache:
+        if not ccache_dir:
+            fail("%s set but %s not set" % (_CCACHE_LABEL, _CCACHE_DIR_LABEL))
+        args.add("--ccache")
+
     # --use-flags
     if ctx.attr.inject_use_flags:
         args.add_joined("--use-flags", ctx.attr.use_flags, join_with = ",")