diff --git a/share/mk/doc.common.mk b/share/mk/doc.common.mk
index bed2402d45..96a7e4e90f 100644
--- a/share/mk/doc.common.mk
+++ b/share/mk/doc.common.mk
@@ -1,176 +1,183 @@
 #
 # $FreeBSD$
 #
 # This include file <doc.common.mk> provides targets and variables for
 # documents commonly used in doc/ and www/ tree.
 #
 
 AWK?=		/usr/bin/awk
 GREP?=		/usr/bin/grep
+REALPATH?=	/bin/realpath
 
 .if defined(DOC_PREFIX) && !empty(DOC_PREFIX)
 WEB_PREFIX?=	${DOC_PREFIX}/../www
 .elif defined(WEB_PREFIX) && !empty(WEB_PREFIX)
 DOC_PREFIX?=	${WEB_PREFIX}/../doc
 .else
 .error "You must define either WEB_PREFIX or DOC_PREFIX!"
 .endif
 
 # ------------------------------------------------------------------------
 #
 # Work out the language and encoding used for this document.
 #
 # Liberal default of maximum of 10 directories below to find it.
 #
 
 .if defined(DOC_PREFIX) && !empty(DOC_PREFIX)
-DOC_PREFIX_NAME!=	realpath ${DOC_PREFIX}
+DOC_PREFIX_NAME!=	${REALPATH} ${DOC_PREFIX}
 DOC_PREFIX_NAME:=	${DOC_PREFIX_NAME:T}
 .else
 DOC_PREFIX_NAME?=	doc
 .endif
 
 .if defined(WEB_PREFIX) && !empty(WEB_PREFIX)
-WWW_PREFIX_NAME!=	realpath ${WEB_PREFIX}
+WWW_PREFIX_NAME!=	${REALPATH} ${WEB_PREFIX}
 WWW_PREFIX_NAME:=	${WWW_PREFIX_NAME:T}
 .else
 WWW_PREFIX_NAME?=	www
 .endif
 
 .if (!defined(LANGCODE) || empty(LANGCODE)) && (!defined(WWW_LANGCODE) || empty(WWW_LANGCODE))
 # Calculate _LANGCODE.
 _LANGCODE:=	${.CURDIR}
 .for _ in 1 2 3 4 5 6 7 8 9 10
 .if !(${_LANGCODE:H:T} == ${DOC_PREFIX_NAME}) && !(${_LANGCODE:H:T} == ${WWW_PREFIX_NAME})
 _LANGCODE:=	${_LANGCODE:H}
 .endif
 .endfor
 .if (${_LANGCODE:H:T} == ${DOC_PREFIX_NAME})
 # We are in doc/.
 _LANGCODE:=	${_LANGCODE:T}
 _WWW_LANGCODE:=	.
 .else
 # We are in www/.
 _WWW_LANGCODE:=	${_LANGCODE:T}
 _LANGCODE:=	.
 .endif
 .else
 # when LANGCODE or WWW_LANGCODE is defined, use the value.
 .if defined(LANGCODE) && !empty(LANGCODE)
 _LANGCODE?=	${LANGCODE}
 .else
 _LANGCODE?=	.
 .endif
 .if defined(WWW_LANGCODE) && !empty(WWW_LANGCODE)
 _WWW_LANGCODE?=	${WWW_LANGCODE}
 .else
 _WWW_LANGCODE?=	.
 .endif
 .endif
 
 # fixup _LANGCODE
 .if (${_LANGCODE} == .)
 # We have a short name such as `en' in ${_WWW_LANGCODE} now.
 # Guess _LANGCODE using _WWW_LANGCODE.
 _LANGCODE:=	${_WWW_LANGCODE}
 .if (${_LANGCODE} != .)
 _LANGCODE!=	${ECHO} ${DOC_PREFIX}/${_WWW_LANGCODE}*
 .for _ in 1 2 3 4 5 6 7 8 9 10
 .if !(${_LANGCODE:H:T} == ${DOC_PREFIX_NAME})
 _LANGCODE:=	${_LANGCODE:H}
 .endif
 .endfor
 _LANGCODE:=	${_LANGCODE:T}
 .endif
 .endif
 LANGCODE?=	${_LANGCODE}
 
 # fixup _WWW_LANGCODE
 .if (${_WWW_LANGCODE} == .)
 # We have a long name such as `en_US.ISO8859-1' in ${LANGCODE} now.
 # Guess _WWW_LANGCODE using _LANGCODE.
 _WWW_LANGCODE!=	${ECHO} ${WEB_PREFIX}/*
 _WWW2_LANGCODE!=	${ECHO} ${_WWW_LANGCODE:T} |\
 		${SED} -e 's,.*\(${LANGCODE:R:C,(..)_.*,\1,}[^. ]*\).*,\1,'
 .if ${_WWW_LANGCODE:T} == ${_WWW2_LANGCODE}
 _WWW_LANGCODE:= .
 .else
 _WWW_LANGCODE:= ${_WWW2_LANGCODE}
 .endif
 .undef _WWW2_LANGCODE
 .endif
 WWW_LANGCODE?=	${_WWW_LANGCODE}
 
+# normalize DOC_PREFIX and WEB_PREFIX
+DOC_PREFIX!=	${REALPATH} ${DOC_PREFIX}
+WEB_PREFIX!=	${REALPATH} ${WEB_PREFIX}
+
 # ------------------------------------------------------------------------
 #
 # mirrors.xml dependency.
 #
 
 XML_MIRRORS_MASTER=	${DOC_PREFIX}/share/sgml/mirrors.xml
 XML_MIRRORS=		${.OBJDIR}/${DOC_PREFIX:S,^${.CURDIR}/,,}/${LANGCODE}/share/sgml/mirrors.xml
 
 XSL_MIRRORS_MASTER=	${DOC_PREFIX}/share/sgml/mirrors-master.xsl
 
 .if exists(${DOC_PREFIX}/${LANGCODE}/share/sgml/mirrors-local.xsl)
 XSL_MIRRORS=		${DOC_PREFIX}/${LANGCODE}/share/sgml/mirrors-local.xsl
 .else
 XSL_MIRRORS=		${DOC_PREFIX}/share/sgml/mirrors-local.xsl
 .endif
 
 XSL_TRANSTABLE_MASTER=	${DOC_PREFIX}/share/sgml/transtable-master.xsl
 XSL_TRANSTABLE_COMMON=	${DOC_PREFIX}/share/sgml/transtable-common.xsl
 
 .if exists(${DOC_PREFIX}/${LANGCODE}/share/sgml/transtable-local.xsl)
 XSL_TRANSTABLE=		${DOC_PREFIX}/${LANGCODE}/share/sgml/transtable-local.xsl
 .else
 XSL_TRANSTABLE=		${DOC_PREFIX}/share/sgml/transtable-local.xsl
 .endif
 
 .if exists(${DOC_PREFIX}/${LANGCODE}/share/sgml/transtable.xml)
 XML_TRANSTABLE=		${DOC_PREFIX}/${LANGCODE}/share/sgml/transtable.xml
 .else
 XML_TRANSTABLE=		${DOC_PREFIX}/share/sgml/transtable.xml
 .endif
 
 ${XSL_MIRRORS}: ${XSL_MIRRORS_MASTER} ${XSL_TRANSTABLE_COMMON}
 
 ${XML_MIRRORS}: ${XML_MIRRORS_MASTER} ${XSL_TRANSTABLE} ${XSL_TRANSTABLE_MASTER} ${XSL_TRANSTABLE_COMMON}
 	${MKDIR} -p ${@:H}
 	${XSLTPROC} ${XSLTPROCOPTS} \
 	    --param 'transtable.xml' "'${XML_TRANSTABLE}'" \
 	    --param 'transtable-target-element' "'country'" \
 	    --param 'transtable-word-group' "'country'" \
 	    --param 'transtable-mode' "'sortkey'" \
 	    ${XSL_TRANSTABLE} ${XML_MIRRORS_MASTER} \
 	  | env -i LANG="${LANGCODE}" ${SORT} -f > $@.sort.tmp
 	env -i ${GREP} "^<?xml" < $@.sort.tmp > $@.sort
 	${ECHO} "<sortkeys>" >> $@.sort
 	env -i ${AWK} '/^  / {sub(/@sortkey@/, ++line); print;}' < $@.sort.tmp >> $@.sort
 	${ECHO} '</sortkeys>' >> $@.sort
 	${XSLTPROC} ${XSLTPROCOPTS} -o $@ \
 	    --param 'transtable.xml' "'${XML_TRANSTABLE}'" \
 	    --param 'transtable-target-element' "'country'" \
 	    --param 'transtable-word-group' "'country'" \
 	    --param 'transtable-sortkey.xml' "'$@.sort'" \
 	    ${XSL_TRANSTABLE} ${XML_MIRRORS_MASTER}
 	${RM} -f $@.sort $@.sort.tmp
 
 CLEANFILES+= ${XML_MIRRORS}
 CLEANFILES+= ${XML_MIRRORS}.sort
 CLEANFILES+= ${XML_MIRRORS}.sort.tmp
 
 #
 # urls.ent dependency.
 #
 
-URLS_ENT=	${.OBJDIR}/${DOC_PREFIX:S,^${.CURDIR}/,,}/share/sgml/urls.ent
+# XXX: .OBJDIR does not work.
+#URLS_ENT=	${.OBJDIR}/${DOC_PREFIX:S,^${.CURDIR}/,,}/share/sgml/urls.ent
+URLS_ENT=	${DOC_PREFIX}/share/sgml/urls.ent
 
 ${URLS_ENT}:
 .if !defined(URLS_ABSOLUTE)
 	echo '<!ENTITY url.main "../../../..">' > $@
 .else
 	echo '<!ENTITY url.main "http://www.FreeBSD.org">' > $@
 .endif
 
 SRCS+=		${URLS_ENT}
 CLEANFILES+=	${URLS_ENT}