Comment 2 for bug 581319

You're right it is the same issue.
I run the debuild from the package directory which any arguments and debuild immediately terminates with the error (on ubuntu precise):
debuild: fatal error at line 640:
don't understand dpkg-parsechangelog output: (standard input):1:Source: pkgname

I noticed that the options '-Hn' to grep are the cause of the problem. Only using the '--color=auto' option does not hurt at all.