The sysutils/bacula package uses some non-standard method to force the
selection of only one of its options, it should use option groups, I guess.
Here's a patch: 

Index: Makefile.options
===================================================================
RCS file: /pub/NetBSD-CVS/pkgsrc/sysutils/bacula/Makefile.options,v
retrieving revision 1.2
diff -u -r1.2 Makefile.options
--- Makefile.options	31 May 2005 10:01:39 -0000	1.2
+++ Makefile.options	7 Oct 2005 09:18:25 -0000
@@ -1,18 +1,12 @@
 # $NetBSD: Makefile.options,v 1.2 2005/05/31 10:01:39 dillo Exp $
 
-PKG_OPTIONS_VAR=	PKG_OPTIONS.bacula
-PKG_SUPPORTED_OPTIONS=	catalog-sqlite catalog-pgsql
-PKG_SUGGESTED_OPTIONS=	catalog-sqlite
+PKG_OPTIONS_VAR=		PKG_OPTIONS.bacula
+PKG_OPTIONS_REQUIRED_GROUPS=	database
+PKG_OPTIONS_GROUP.database=	catalog-sqlite catalog-pgsql
+PKG_SUGGESTED_OPTIONS=		catalog-sqlite
 
 .include "../../mk/bsd.options.mk"
 
-# Too bad -1-6's make doesn't have :[#] modifier
-.for _option_ in catalog
-. if empty(PKG_OPTIONS:M${_option_}-*)
-PKG_FAIL_REASON+=	"There must one and only one ${_option_} defined."
-. endif
-.endfor
-
 # Other options
 
 BACULA_GROUP?=		bacula



Also, this bug in the documentation made it take longer than necessary to
figure out the above. :-)  

--- options.html	2005-10-07 11:11:23.000000000 +0200
+++ options.html	005-10-07 11:11:43.000000000 +0200
@@ -125,8 +125,8 @@
       <pre class="programlisting">
 PKG_OPTIONS_VAR=                PKG_OPTIONS.wibble
 PKG_SUPPORTED_OPTIONS=          wibble-foo ldap
-PKG_OPTIONAL_GROUPS=            database
-PKG_GROUP.database=             mysql pgsql
+PKG_OPTIONS_OPTIONAL_GROUPS=    database
+PKG_OPTIONS_GROUP.database=     mysql pgsql
 PKG_SUGGESTED_OPTIONS=          wibble-foo
 PKG_OPTIONS_LEGACY_VARS+=       WIBBLE_USE_OPENLDAP:ldap
 PKG_OPTIONS_LEGACY_OPTS+=       foo:wibble-foo


	Geert