Ruby18 packages required but smae Ruby19 packages are installed???

[newhouse%rockhead.com@localhost (Paul Newhouse)]

# uname -a
NetBSD pimin 5.99.40 NetBSD 5.99.40 (GENERIC) #1: Sat Nov 27 21:52:33 PST 2010  
root@pimin:/glorp/obj/sys/arch/i386/compile/GENERIC i386


# cat CVS/Tag
Tpkgsrc-2010Q3

I'm confused, running "pkg_rolling-replace -rsuv" produces:


   RR> Packages to rebuild:
   rr> MISMATCH_TODO=[ruby18-gdbm ruby18-curses ruby18-readline ruby18-gdbm]
   rr> REBUILD_TODO=[]
   rr> UNSAFE_TODO=[]
   RR> Building dependency graph for installed packages
   RR> Tsorting dependency graph
   RR> Selecting p5-Catalyst-Authentication-Credential-HTTP-Proxy 
           (www/p5-Catalyst-Authentication-Credential-HTTP-Proxy) as next 
package to replace
   RR> Replacing p5-Catalyst-Authentication-Credential-HTTP-Proxy-0.06nb1
   RR> Would run: /usr/bin/make IN_PKG_ROLLING_REPLACE=1 clean || fail=1
   RR> Would run: /usr/bin/make IN_PKG_ROLLING_REPLACE=1 replace || fail=1
   RR> Re-checking for unsafe installed packages (unsafe_depends_strict=YES)
   RR> Packages to rebuild:
   rr> MISMATCH_TODO=[ruby18-gdbm ruby18-curses ruby18-readline ruby18-gdbm]
   rr> REBUILD_TODO=[]
   rr> UNSAFE_TODO=[]
   ... over and over ad nausea

But these packages are installed

   pimin[root]: pkg_info|grep ruby
   ruby19-gdbm-1.9.2pl0 Ruby extension to GDBM library
   ruby19-readline-1.9.2pl0 Ruby extension to readline library
   ruby19-base-1.9.2pl0nb1 Ruby 1.9 based release minimum package
   ruby19-curses-1.9.2pl0 Ruby extension to curses library


How do I find ut what packages are referencing ruby18?

TIA,
Paul