Cups does not compile with dbus-0.20, from Ximian's Project Utopia.
I have not tried redhat's dbus-0.13. If this version of dbus is too
high for cups, the srpm requires list should say so. 

dbus-0.20-3
cups-1.1.20-2.src.rpm

gcc -O2 -g -pipe -march=athlon -I/usr/kerberos/include   
-DOPENSSL_DISABLE_OLD_DES_SUPPORT -I/usr/kerberos/include  
-I/usr/kerberos/include   -I..  -fpie `pkg-config --cflags dbus-1`
-DDBUS_API_SUBJECT_TO_CHANGE -c main.c
main.c: In function `dbus_broadcast':
main.c:119: error: `DBUS_SERVICE_BROADCAST' undeclared (first use in
this function)
main.c:119: error: (Each undeclared identifier is reported only once
main.c:119: error: for each function it appears in.)
main.c:119: warning: passing arg 1 of `dbus_message_new' makes integer
from pointer without a cast
main.c:119: error: too many arguments to function `dbus_message_new'
make[1]: *** [main.o] Error 1
make[1]: Leaving directory `/usr/src/redhat/BUILD/cups-1.1.20/scheduler'
make: *** [all] Error 1
error: Bad exit status from /var/tmp/rpm-tmp.43105 (%build)
                                                                     
                                                       
                                                                     
                                                       
RPM build errors:
    Bad exit status from /var/tmp/rpm-tmp.43105 (%build)