configure check for docbook2man program, used in the new XML-based man

page build target.  This covers from-source, Debian, and Fedora
installation variants.

configure

@@ -766,6 +766,7 @@ have_docbook
 DOCBOOKSTYLE
 COLLATEINDEX
 SGMLSPL
+DOCBOOK2MAN
 vpath_build
 LTLIBOBJS'
 ac_subst_files=''
@@ -25880,6 +25881,37 @@ fi
   test -n "$SGMLSPL" && break
 done
 
+{ echo "$as_me:$LINENO: checking for docbook2man" >&5
+echo $ECHO_N "checking for docbook2man... $ECHO_C" >&6; }
+if test "${ac_cv_path_DOCBOOK2MAN+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  if test -z "$DOCBOOK2MAN"; then
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+  for ac_prog in docbook2x-man db2x_docbook2man docbook2man; do
+    ac_path="$as_dir/$ac_prog"
+    { test -f "$ac_path" && $as_test_x "$ac_path"; } || continue
+    if "$ac_path" --version 2>/dev/null | $GREP docbook2x >/dev/null 2>&1; then
+      ac_cv_path_DOCBOOK2MAN=$ac_path
+      break
+    fi
+  done
+done
+IFS=$as_save_IFS
+
+else
+  ac_cv_path_DOCBOOK2MAN=$DOCBOOK2MAN
+fi
+fi
+{ echo "$as_me:$LINENO: result: $ac_cv_path_DOCBOOK2MAN" >&5
+echo "${ECHO_T}$ac_cv_path_DOCBOOK2MAN" >&6; }
+DOCBOOK2MAN=$ac_cv_path_DOCBOOK2MAN
+
+
 
 # Thread testing
 
@@ -27004,11 +27036,12 @@ have_docbook!$have_docbook$ac_delim
 DOCBOOKSTYLE!$DOCBOOKSTYLE$ac_delim
 COLLATEINDEX!$COLLATEINDEX$ac_delim
 SGMLSPL!$SGMLSPL$ac_delim
+DOCBOOK2MAN!$DOCBOOK2MAN$ac_delim
 vpath_build!$vpath_build$ac_delim
 LTLIBOBJS!$LTLIBOBJS$ac_delim
 _ACEOF
 
-  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 53; then
+  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 54; then
     break
   elif $ac_last_try; then
     { { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5