All reports of debian-rules-not-a-makefile for the archive. The extended description of this tag is:
The debian/rules file for this package does not appear to be a makefile or does not start with the required line. debian/rules must be a valid makefile and must have "#!/usr/bin/make -f" as its first line.
Refer to Debian Policy Manual section 4.9 (Main building script:
debian/rules) for details.
This tag has not been emitted in any package tested by Lintian.