`/usr/share/sgml/docbook/xsl-stylesheets` and `/usr/share/dblatex` are
places where docbook-style-xsl and, respectively, dblatex packages on
Red Hat systems put their XSL templates. Unless we hint this place it
has to be added to `./configure` manually (`--with-docbook-xsl=...`):
https://src.fedoraproject.org/rpms/bind/blob/master/f/bind.spec#_691.
On Fedora 30:
Before
```
./configure
...
checking for Docbook-XSL path... auto
checking for html/docbook.xsl... "not found"
checking for xhtml/docbook.xsl... "not found"
checking for manpages/docbook.xsl... "not found"
checking for html/chunk.xsl... "not found"
checking for xhtml/chunk.xsl... "not found"
checking for html/chunktoc.xsl... "not found"
checking for xhtml/chunktoc.xsl... "not found"
checking for html/maketoc.xsl... "not found"
checking for xhtml/maketoc.xsl... "not found"
checking for xsl/docbook.xsl... "not found"
checking for xsl/latex_book_fast.xsl... "not found"
```
After:
```
./configure
...
checking for Docbook-XSL path... auto
checking for html/docbook.xsl... /usr/share/sgml/docbook/xsl-stylesheets/html/docbook.xsl
checking for xhtml/docbook.xsl... /usr/share/sgml/docbook/xsl-stylesheets/xhtml/docbook.xsl
checking for manpages/docbook.xsl... /usr/share/sgml/docbook/xsl-stylesheets/manpages/docbook.xsl
checking for html/chunk.xsl... /usr/share/sgml/docbook/xsl-stylesheets/html/chunk.xsl
checking for xhtml/chunk.xsl... /usr/share/sgml/docbook/xsl-stylesheets/xhtml/chunk.xsl
checking for html/chunktoc.xsl... /usr/share/sgml/docbook/xsl-stylesheets/html/chunktoc.xsl
checking for xhtml/chunktoc.xsl... /usr/share/sgml/docbook/xsl-stylesheets/xhtml/chunktoc.xsl
checking for html/maketoc.xsl... /usr/share/sgml/docbook/xsl-stylesheets/html/maketoc.xsl
checking for xhtml/maketoc.xsl... /usr/share/sgml/docbook/xsl-stylesheets/xhtml/maketoc.xsl
checking for xsl/docbook.xsl... /usr/share/dblatex/xsl/docbook.xsl
checking for xsl/latex_book_fast.xsl... /usr/share/dblatex/xsl/latex_book_fast.xsl
```
(cherry picked from commit
0055b9616e00c6af4fc6116baae99bd80616cfab)
auto)
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: auto" >&5
$as_echo "auto" >&6; }
- docbook_xsl_trees="/usr/pkg/share/xsl/docbook /usr/local/share/xsl/docbook-ns /usr/local/share/xsl/docbook /usr/share/xsl/docbook /opt/local/share/xsl/docbook-xsl /opt/local/share/xsl/docbook-xsl-nons /usr/share/xml/docbook/stylesheet/docbook-xsl"
+ docbook_xsl_trees="/usr/pkg/share/xsl/docbook /usr/local/share/xsl/docbook-ns /usr/local/share/xsl/docbook /usr/share/xsl/docbook /usr/share/sgml/docbook/xsl-stylesheets /opt/local/share/xsl/docbook-xsl /opt/local/share/xsl/docbook-xsl-nons /usr/share/xml/docbook/stylesheet/docbook-xsl"
;;
*)
docbook_xsl_trees="$withval"
case "$docbook_path" in
auto)
AC_MSG_RESULT(auto)
- docbook_xsl_trees="/usr/pkg/share/xsl/docbook /usr/local/share/xsl/docbook-ns /usr/local/share/xsl/docbook /usr/share/xsl/docbook /opt/local/share/xsl/docbook-xsl /opt/local/share/xsl/docbook-xsl-nons /usr/share/xml/docbook/stylesheet/docbook-xsl"
+ docbook_xsl_trees="/usr/pkg/share/xsl/docbook /usr/local/share/xsl/docbook-ns /usr/local/share/xsl/docbook /usr/share/xsl/docbook /usr/share/sgml/docbook/xsl-stylesheets /opt/local/share/xsl/docbook-xsl /opt/local/share/xsl/docbook-xsl-nons /usr/share/xml/docbook/stylesheet/docbook-xsl"
;;
*)
docbook_xsl_trees="$withval"