diff --git a/libc/kernel/tools/utils.py b/libc/kernel/tools/utils.py
index e5a310e..e2cc9ce 100644
--- a/libc/kernel/tools/utils.py
+++ b/libc/kernel/tools/utils.py
@@ -13,8 +13,26 @@
     sys.exit(1)
 
 
-def find_program_dir():
-    return os.path.dirname(sys.argv[0])
+def get_kernel_headers_dir():
+    return os.path.join(get_android_root(), "external/kernel-headers")
+
+
+def get_kernel_headers_original_dir():
+    return os.path.join(get_kernel_headers_dir(), "original")
+
+
+def get_kernel_headers_modified_dir():
+    return os.path.join(get_kernel_headers_dir(), "modified")
+
+
+def get_kernel_dir():
+    return os.path.join(get_android_root(), "bionic/libc/kernel")
+
+
+def get_android_root():
+    if "ANDROID_BUILD_TOP" in os.environ:
+        return os.environ["ANDROID_BUILD_TOP"]
+    panic("Unable to find root of tree, did you forget to lunch a target?")
 
 
 class StringOutput: