net/samba48 fails to build if MANDOC option is enabled.

Tail end of build log from Poudriere:

runtime error: file file:///usr/local/share/xsl/docbook/lib/lib.xsl line 58 element choose
xsltApplySequenceConstructor: A potential infinite template recursion was detected.
You can adjust xsltMaxDepth (--maxdepth) in order to raise the maximum number of nested template calls and variables/params (currently set to 3000).
Templates:
#0 name string.subst 
#1 name string.subst 
#2 name string.subst 
#3 name string.subst 
#4 name string.subst 
#5 name string.subst 
#6 name string.subst 
#7 name string.subst 
#8 name string.subst 
#9 name string.subst 
#10 name string.subst 
#11 name string.subst 
#12 name string.subst 
#13 name string.subst 
#14 name string.subst 
Variables:
#0
replacement 
target 
string 
#1
target 
string 
#2
string 
#3
replacement 
target 
string 
#4
target 
string 
#5
string 
#6
replacement 
target 
string 
#7
target 
string 
#8
string 
#9
replacement 
target 
string 
#10
target 
string 
#11
string 
#12
replacement 
target 
string 
#13
target 
string 
#14
string 
error: file default/docs-xml/manpages/smb.conf.5.xml
xsltRunStylesheet : run failed
Waf: Leaving directory `/wrkdirs/usr/ports/net/samba48/work/samba-4.8.5/bin'
Build failed:  -> task failed (err #11): 
	{task: manpages/smb.conf.5 smb.conf.5.xml,parameters.all.xml -> smb.conf.5}
*** Error code 1

Stop.
make: stopped in /usr/ports/net/samba48

Config options:
OPTIONS_FILE_SET+=ADS
OPTIONS_FILE_SET+=AD_DC
OPTIONS_FILE_SET+=AESNI
OPTIONS_FILE_UNSET+=CLUSTER
OPTIONS_FILE_SET+=CUPS
OPTIONS_FILE_UNSET+=DEBUG
OPTIONS_FILE_UNSET+=DEVELOPER
OPTIONS_FILE_SET+=DOCS
OPTIONS_FILE_SET+=FAM
OPTIONS_FILE_UNSET+=GPGME
OPTIONS_FILE_SET+=LDAP
OPTIONS_FILE_SET+=MANDOC
OPTIONS_FILE_UNSET+=NTVFS
OPTIONS_FILE_SET+=PROFILE
OPTIONS_FILE_SET+=QUOTAS
OPTIONS_FILE_UNSET+=SPOTLIGHT
OPTIONS_FILE_SET+=SYSLOG
OPTIONS_FILE_SET+=UTMP
OPTIONS_FILE_SET+=GSSAPI_BUILTIN
OPTIONS_FILE_UNSET+=GSSAPI_MIT
OPTIONS_FILE_UNSET+=NSUPDATE
OPTIONS_FILE_UNSET+=BIND911
OPTIONS_FILE_UNSET+=MDNSRESPONDER
OPTIONS_FILE_UNSET+=AVAHI