Sybase Central fails to start after ASE install [CR #618082]

After installing Adaptive Server Enterprise (ASE) in the same directory in which Sybase IQ is already installed, Sybase Central fails to start and this error is reported:

Unable to locate the Java Runtime Environment
($SYBASE_JRE6).
The directory $SYBROOT[/shared]/jre-6_0 is missing or invalid.

Workaround:

Source IQ-15_2.csh for Sybase IQ, then source SYBASE.csh for ASE, before starting Sybase Central:

cd $SYBASE
source IQ-15_2.csh
source SYBASE.csh
cd $SYBASE/shared/sybcentral600
./scjview.sh &