diff --git a/git_rev_macro.py b/git_rev_macro.py
new file mode 100644
index 0000000..850e953
--- /dev/null
+++ b/git_rev_macro.py
@@ -0,0 +1,8 @@
+import subprocess
+
+revision = (
+    subprocess.check_output(["git", "rev-parse", "HEAD"])
+    .strip()
+    .decode("utf-8")
+)
+print("-DFW_GIT_REV='\"%s\"'" % revision)
\ No newline at end of file