[LAU] Qtractor 0.9.19 from source tarball

Mint 20 on an intel NUC I think I must be missing an obvious step here. Following instructions from the qtractor-manual-and-howtos.pdf section 2.2. Hadn't used 'apt-get build-dep' before, so I tried it: $ sudo apt-get build-dep qtractor Reading package lists... Done E: You must put some 'deb-src' URIs in your sources.list I usually use Synaptic to install dependencies, so I went that way, but: john@NUC1:~/qtractor-0.9.19/src$ ./configure --help bash: ./configure: No such file or directory and, sure enough, there is no such file. Do I need to install 'autoconf' and run that somehow? Thanks. -- Pretty good offer at NI currently: 50% off u-he products! https://www.native-instruments.com/en/specials/komplete/u-he-offer-2020/