diff --git a/doc/xschem_man/tutorial_xschem_sky130.html b/doc/xschem_man/tutorial_xschem_sky130.html
index 3d0dbb2a..cc131593 100644
--- a/doc/xschem_man/tutorial_xschem_sky130.html
+++ b/doc/xschem_man/tutorial_xschem_sky130.html
@@ -51,7 +51,7 @@ cd release
 ## build the program
 make
 ## install the program and needed files.
-make install
+sudo make install
  </pre><br><br>
    <h2 style="text-align: center;">IMPORTANT!!</h2><br>
  <p class="important">
@@ -87,7 +87,7 @@ cd open_pdks
 ##  reported after each step.
 ./configure --enable-sky130-pdk 
 make
-make install </pre><br>
+sudo make install </pre><br>
 
   <p class="important"> If you want to install also the gf180mcu pdk replace the above ./configure command 
    with the following:</p> <br>
diff --git a/tests/run_regression.tcl b/tests/run_regression.tcl
index 94f1ae38..17dc56ec 100644
--- a/tests/run_regression.tcl
+++ b/tests/run_regression.tcl
@@ -57,4 +57,4 @@ foreach tc $tcases {
 }
 
 source test_utility.tcl
-exec $xschem_cmd -q --script xschemtest.tcl > stefan_xschemtest.log 2>@1
+exec $xschem_cmd --pipe -q --script xschemtest.tcl > stefan_xschemtest.log 2>@1