install gulp globally

Jenkinsfile

@@ -17,10 +17,6 @@ switch (env.BRANCH_NAME) {
 }
 
 node {
-    //env.NODEJS_HOME = "${tool 'node-8.12.0'}"
-    // on linux / mac
-    //env.PATH="${env.NODEJS_HOME}/bin:${env.PATH}"
-
     stage ('Print environment variables') {
         echo "Branch ${env.BRANCH_NAME}, build number ${env.BUILD_NUMBER}, environment ${env.NODE_ENV}"
     }
@@ -29,6 +25,7 @@ node {
     }
     stage ('Install Node dependencies') {
         nodejs('node-8.12.0') {
+            sh "npm install gulp -g"
             sh "npm install --only=prod"
             sh "npm install --only=dev"
             sh "gulp install"