Don't use pushd/popd in autogen.sh; Ubuntu's /bin/sh doesn't support it.

autogen.sh

@@ -5,7 +5,7 @@ echo "This may take a while ..."
 
 srcdir=`dirname $0`
 test -z "$srcdir" && srcdir=.
-pushd $srcdir
+cd "$srcdir"
 
 # Regenerate configuration files
 cat acinclude/* >aclocal.m4
@@ -19,7 +19,5 @@ if test x$found = xfalse; then
 fi
 (cd test; sh autogen.sh)
 
-popd
-
 # Run configure for this platform
 echo "Now you are ready to run ./configure"