update readme for build with source date epoch

diff --git a/readme.md b/readme.md
index 868b4a8f1f501c91fdb6c802f98cb31bb08fd74d..4d4e3f57986c835f8b18745a83ea17ac9a326df2 100644 (file)
--- a/readme.md
+++ b/readme.md
@@ -80,7 +80,7 @@ Build Package
 ```bash
 mkdir build && cd build
 cmake -DCMAKE_BUILD_TYPE=Release ..
-make package
+SOURCE_DATE_EPOCH=$(git log --max-count=1 --pretty="%ct") make package
 ```
 
 Install Package