diff --git a/Misc/build.sh b/Misc/build.sh
index a5a7d49eaf1..b55467562c9 100755
--- a/Misc/build.sh
+++ b/Misc/build.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/sh -x
 
 ## Script to build and test the latest python from svn.  It basically
 ## does this:
@@ -212,7 +212,7 @@ if [ $err = 0 -a "$BUILD_DISABLED" != "yes" ]; then
             ## make and run basic tests
             F=make-test.out
             start=`current_time`
-            $PYTHON $REGRTEST_ARGS -u urlfetch >& build/$F
+            $PYTHON $REGRTEST_ARGS -W -u urlfetch >& build/$F
             NUM_FAILURES=`count_failures build/$F`
             place_summary_first build/$F
             update_status "Testing basics ($NUM_FAILURES failures)" "$F" $start
@@ -220,7 +220,7 @@ if [ $err = 0 -a "$BUILD_DISABLED" != "yes" ]; then
 
             F=make-test-opt.out
             start=`current_time`
-            $PYTHON -O $REGRTEST_ARGS -u urlfetch >& build/$F
+            $PYTHON -O $REGRTEST_ARGS -W -u urlfetch >& build/$F
             NUM_FAILURES=`count_failures build/$F`
             place_summary_first build/$F
             update_status "Testing opt ($NUM_FAILURES failures)" "$F" $start
@@ -243,7 +243,7 @@ if [ $err = 0 -a "$BUILD_DISABLED" != "yes" ]; then
             start=`current_time`
             ## skip curses when running from cron since there's no terminal
             ## skip sound since it's not setup on the PSF box (/dev/dsp)
-            $PYTHON $REGRTEST_ARGS -uall -x test_curses test_linuxaudiodev test_ossaudiodev >& build/$F
+            $PYTHON $REGRTEST_ARGS -W -uall -x test_curses test_linuxaudiodev test_ossaudiodev >& build/$F
             NUM_FAILURES=`count_failures build/$F`
             place_summary_first build/$F
             update_status "Testing all except curses and sound ($NUM_FAILURES failures)" "$F" $start