Example:
https://build.opensuse.org/package/show/isv:ownCloud:devel/php5-apcu
The binary output shows two dependencies:
php5-apcu_4.0.6-1+4+oc_amd64.deb as built for xUbuntu_14.04 shows two dependencies:

libc6 (>= 2.14) provided by libc6
phpapi-20121212 provided by php5-common

Both of these are important.


I have branched the package to 
https://build.opensuse.org/package/show/home:jnweiger:branches:isv:ownCloud:devel/php5-apcu
where the only linkdiff is changing the value of debian.compat from 1 to 5.
This change appears to be recommended, it silences a warning in the build log.

Now
https://build.opensuse.org/package/binary/home:jnweiger:branches:isv:ownCloud:devel/php5-apcu?arch=x86_64&filename=php5-apcu_4.0.6-1%2B4%2Boc_amd64.deb&repository=xUbuntu_14.04
shows "no requires", which is wrong. It should list the same dependencies as above.

This issue is critical with php modules, where a
Depends: phpapi = 20121212
line (or similar) is used to assert that the package gets installed only on a matching environment. With any debian.compat value except 1, these Depends: get stripped, and users easily break their php installation, if it was not the original php, but an updated stack with an incompatible phpapi version pulled from e.g. ubuntu universe.