diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index d190c73947553b1cb6db4a16411f4dbe7c951965..f4a278d5eb36a7d7b3634fe4aca3f8a5decf54cf 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -572,8 +572,9 @@ LCGPackage_Add(
   INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory <SOURCE_DIR>/dist <INSTALL_DIR>
           COMMAND ${CMAKE_COMMAND} -E make_directory <INSTALL_DIR>/lib/python2.7/site-packages
 #	  COMMAND ${CMAKE_COMMAND} -E copy <INSTALL_DIR>/python/lib/py4j-0.9-src.zip <INSTALL_DIR>/lib/python2.7/site-packages/.
-	  COMMAND ${CMAKE_COMMAND} -E copy <INSTALL_DIR>/python/lib/pyspark.zip  <INSTALL_DIR>/lib/python2.7/site-packages/. 
-	  COMMAND ${CMAKE_COMMAND} -E unzip <INSTALL_DIR>/lib/python2.7/site-packages/pyspark.zip 
+	  COMMAND ${CMAKE_COMMAND} -E copy <INSTALL_DIR>/python/lib/pyspark.zip  <INSTALL_DIR>/lib/python2.7/site-packages/.
+	  COMMAND ${CMAKE_COMMAND} -E chdir <INSTALL_DIR>/lib/python2.7/site-packages/ unzip pyspark.zip   
+
   BUILD_IN_SOURCE 1
 )
 
diff --git a/pyexternals/CMakeLists.txt b/pyexternals/CMakeLists.txt
index 92e272a372d919a3e2b26c518ab1e771c862f8bf..1af001661e37e89faa33ed2f72c2f46cda5b1c7e 100644
--- a/pyexternals/CMakeLists.txt
+++ b/pyexternals/CMakeLists.txt
@@ -641,19 +641,19 @@ LCGPackage_Add(
 #---py4j------------------------------------------------------------------------------------------------------
 LCGPackage_Add(
   py4j
-  URL http://service-spi.web.cern.ch/service-spi/external/tarFiles/py4j-${py4j_native_version}-src.zip
+  URL http://service-spi.web.cern.ch/service-spi/external/tarFiles/py4j-${py4j_native_version}.tar.gz
   CONFIGURE_COMMAND <VOID>
-  BUILD_COMMAND ${Python_cmd} setup.py build
+  BUILD_COMMAND ${Exec_cmd} PYTHONPATH=${pytools_home}/lib/python${Python_config_version_twodigit}/site-packages
+                ${Python_cmd} setup.py build
   INSTALL_COMMAND ${Lock_cmd}
-          COMMAND ${Python_cmd} setup.py install --prefix <INSTALL_DIR>
+          COMMAND ${Exec_cmd} PYTHONPATH=${pytools_home}/lib/python${Python_config_version_twodigit}/site-packages
+                  ${Python_cmd} setup.py install --prefix <INSTALL_DIR>
           COMMAND ${Unlock_cmd}
   BUILD_IN_SOURCE 1
   DEST_NAME pytools
   DEPENDS Python
 )
 
-
-
 #---py------------------------------------------------------------------------------------------------------
 LCGPackage_Add(
   py