don't freak out if the makefile isn't there.

Jenkinsfile

@@ -5,7 +5,7 @@ pipeline {
       steps {
         sh '''cd xybrid
 make clean || true
-rm Makefile'''
+rm Makefile || true'''
       }
     }
     stage('qbuild') {
@@ -14,9 +14,9 @@ rm Makefile'''
       }
     }
     stage('Make') {
-	steps {
-	sh 'make'
-	}
+      steps {
+        sh 'make'
+      }
     }
   }
-}
+}