diff --git a/packages/default.do b/packages/default.do
index aa6b525..233ed24 100644
--- a/packages/default.do
+++ b/packages/default.do
@@ -4,6 +4,30 @@ case "$1" in
         for d in src/*.js; do [ -f "$d" ] && echo lib/$(basename "$d"); done | xargs redo-ifchange
         for d in *.webpack.config.js
         do
+            depifchange=''
+            depifcreate=''
+            for dep in $(cat package.json | \
+                             jq -r '.dependencies | to_entries[].key' | \
+                             fgrep '@syndicate-lang/' | \
+                             sed -e 's:^@syndicate-lang/::' | \
+                             fgrep -v 'core') ## core doesn't have any compilation step
+            do
+                for srcfile in ../$dep/src/*.js
+                do
+                    if [ -f $srcfile ]
+                    then
+                        libfile=$(echo $srcfile | sed -e 's:/src/:/lib/:')
+                        if [ -f $libfile ]
+                        then
+                            depifchange="$depifchange $libfile"
+                        else
+                            depifcreate="$depifcreate $libfile"
+                        fi
+                    fi
+                done
+            done
+            redo-ifchange $depifchange
+            redo-ifchange $depifcreate
             [ -f "$d" ] && echo dist/$(basename "$d" .webpack.config.js).js
         done | xargs redo-ifchange
         [ -f _all.do ] && redo-ifchange _all || true