diff --git a/build b/build
index d3fac8e26..af2421d4a 100755
--- a/build
+++ b/build
@@ -4,7 +4,14 @@ set -e
 
 . scripts.inc
 
+rm -rf dist
+
 for dir in $DEVEL; do
   echo $dir
   (cd $dir && make build BUILDFLAGS="$BUILDFLAGS")
 done
+
+# add build hash to outputs
+ver=$(cat meta/version)
+hash=$(cat meta/buildhash)
+(cd dist && rename "s/$ver/${ver}+$hash/" *.whl)