diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 44cc1b9..be4c0b9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -25,7 +25,7 @@ jobs:
 
       - name: Build project
         run: |
-          ( cd usr/local/bin/brew/Library/Taps/openrtm/homebrew-omniorb ; bash build.sh )
+          ( cd /usr/local/bin/brew/Library/Taps/openrtm/homebrew-omniorb ; bash build.sh )
 
   build-apple-silicon:
     name: omniORB Formula build on macOS (ARM64)
diff --git a/build.sh b/build.sh
index ae4e999..1f968ce 100755
--- a/build.sh
+++ b/build.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
 build=(
-#    "omniorb-ssl-py39   python@3.9"
-#    "omniorb-ssl-py310  python@3.10"
+    "omniorb-ssl-py39   python@3.9"
+    "omniorb-ssl-py310  python@3.10"
     "omniorb-ssl-py311  python@3.11"
     "omniorb-ssl-py312  python@3.12"
     "omniorb-ssl-py313  python@3.13"
@@ -40,6 +40,11 @@ cleanup()
 {
     for ((i=0; ${#build[*]}>$i; i++)) ; do
         tmp=(${build[$i]})
+        installed=`brew info ${tmp[0]} | grep Installed`
+        if test "x" = "x$installed" ; then
+             echo "Not installed: ${tmp[0]}. Do nothing."
+             continue
+        fi
         echo "Cleanup: ${tmp[0]}"
         brew unlink "${tmp[0]}"
         brew remove --ignore-dependencies "${tmp[0]}"