diff --git a/pipelines/build.sh b/pipelines/build.sh
index b265481748b439ec2df052b85420b2afd424afb7..3925e2fdc2ef8e4a31593a5a7da1839726c3ee8f 100644
--- a/pipelines/build.sh
+++ b/pipelines/build.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 echo "===================== prepare for installation ====================="
+# show where I am
 echo " > whoami"
 whoami
 echo " > uname -a"
@@ -14,6 +15,7 @@ export CSST_SIMS_C3="/nfsdata/share/csst_simulation_data/Cycle-3-SimuData/"
 export CSST_SIMS_C5_2="/nfsdata/share/csst_simulation_data/Cycle-5-SimuData/"
 export AUX_DIR="/nfsdata/users/csstpipeline/L1Pipeline/unittests/"
 
+# show Python environment
 echo " > which python"
 which python
 echo " > which pip"
@@ -22,14 +24,21 @@ echo " > python --version"
 python --version
 
 echo "===================== install requirements ====================="
-pip install -r requirements.txt
+if [ -f "requirements.txt" ]; then
+  pip install -r requirements.txt
+fi
 
 echo "===================== install package ====================="
-rm -rf dist
-python setup.py build_ext --inplace
-#python setup.py install
-python setup.py sdist
-pip install dist/*.tar.gz --force-reinstall
+if [ -f "install_local.sh" ]; then
+  sh install_local.sh
+else
+  # default install script
+  rm -rf dist
+  #python setup.py build_ext --inplace
+  #python setup.py install
+  python setup.py sdist
+  pip install dist/*.tar.gz --force-reinstall --no-deps
+fi
 
 echo "===================== show package info ====================="
 echo " > pip show $JOB_NAME"