More defaults

vars/buildStep.groovy

@@ -4,16 +4,18 @@ import groovy.transform.Field
 
 @Field
 Map defaults = [
+    buildTest: 'Makefile',
     buildCmd: 'make all'
 ]
 
-
 def call(Map config = [:]) {
     assert config.artifacts : 'must specify artifacts!'
-
-    config = defaults + config
-    if ( fileExists(config.buildCmd)) {
-        sh 'make'
+    String runConfig = defaults + config
+    if ( fileExists(runConfig.buildTest)) {
+        sh """
+            ${runConfig.buildCmd}
+        """
+    } else {
+        echo "Skipping buildStep since ${runConfig.buildTest} does not exist in workspace."
     }
-
 }