Debian package rsb-tools-cpp0.7 depends strictly on rsb0.7 ...
... but should depend on either rsb0.7 or rsb0.7-with-spread.
#2 Updated by J. Wienke about 9 years ago
CPACK_DEBIAN_PACKAGE_PROVIDES Mandatory : NO Default : - see http://www.debian.org/doc/debian-policy/ch-relationships.html#s-binarydeps A virtual package is one which appears in the Provides control field of another package.
CPack seems to be able to handle this. So rsb-spread and rsb should somehow both provide an rsb metapackage where all others depend on.