Comment 9 for bug 183011

Its the same on hardy.
so to do the fix on both hardy and gutsy :

sudo apt-get source portaudio19
sudo apt-get build-dep portaudio19

cd /portaudio19-19+svn20071207/debian

edit rules and remove ENABLE_JACK = no from line 48

cd ..

dpkg-buildpackage -rfakeroot -b

then cd back to below your portaudio source directory

install the new debs
sudo dpkg -i libportaudiocpp0_19+svn20071207-0ubuntu1_i386.deb portaudio19-dev_19+svn20071207-0ubuntu1_i386.deb libportaudio2_19+svn20071207-0ubuntu1_i386.deb

then restart mixxx and jack and it should all work

it runs slower than it used to on gutsy for me.