I have a Debian source package, it contains a standard debian/control file, which lists a "Build-Depends:" field.
How can I install those build depends without a lot copy and paste?
The package is not in Debian repository. So apt-get build-dep won't work.
Try mk-build-deps from devscripts package.
mk-build-deps --install <controfile>
PS: Make sure you have package equivs installed also.