HAWQ-1421. PXF rpm updates to make it oss friendly
diff --git a/pxf/Makefile b/pxf/Makefile
index 2959f9c..7405878 100644
--- a/pxf/Makefile
+++ b/pxf/Makefile
@@ -47,7 +47,7 @@
 	@echo "help it is then"
 	@echo   "Possible targets"
 	@echo	"  - all (clean, build, unittest, jar, tar, rpm)"
-	@echo	"  -  -  HD=<phd|hdp> - set classpath to match hadoop distribution. default phd"
+	@echo	"  -  -  HD=<hdp> - set classpath to match hadoop distribution. default will be apache hadoop compliant"
 	@echo	"  -  -  LICENSE=<license info> - add license info to created RPMs"
 	@echo	"  -  -  VENDOR=<vendor name> - add vendor name to created RPMs"
 	@echo	"  -  -  PLUGINS_EXCLUDE_RPM=plugin1, plugin2,... - do not build and RPM for given comma-separated list of plugins"
diff --git a/pxf/build.gradle b/pxf/build.gradle
index 99ad5bb..802b1e4 100644
--- a/pxf/build.gradle
+++ b/pxf/build.gradle
@@ -41,12 +41,12 @@
     }   
 }
 
-// Hadoop distribution (can be phd or hdp) - needed to set correct classpaths
+// Hadoop distribution (can be hdp or null which would default to apache) - needed to set correct classpaths
 // can be set with -Dhd=<value>
 def hddist = System.properties['hd'] ?: '';
-//if (hddist != 'phd' && hddist != 'hdp') {
-//    throw new GradleException("hadoop distribution parameter (hd) set to invalid value: $hddist")
-//}
+if (hddist != 'hdp' && hddist != '') {
+    throw new GradleException("hadoop distribution parameter (hd) set to invalid value: $hddist")
+}
 
 // Some package names need to be renamed to include the version number
 // as part of the package name to enable side by side install of two versions of the same package.