Update configure script

configure

@@ -12398,7 +12398,6 @@ done
   done
 IFS=$as_save_IFS
 
-  test -z "$ac_cv_path_ASCIIDOC" && ac_cv_path_ASCIIDOC="asciidoc"
   ;;
 esac
 fi
@@ -12412,6 +12411,7 @@ $as_echo "no" >&6; }
 fi
 
 
+  test x"${ASCIIDOC}" != x || as_fn_error $? "Cannot find \`asciidoc\` in PATH." "$LINENO" 5
   # Extract the first word of "xmlto", so it can be a program name with args.
 set dummy xmlto; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
@@ -12439,7 +12439,6 @@ done
   done
 IFS=$as_save_IFS
 
-  test -z "$ac_cv_path_XMLTO" && ac_cv_path_XMLTO="xmlto"
   ;;
 esac
 fi
@@ -12453,6 +12452,7 @@ $as_echo "no" >&6; }
 fi
 
 
+  test x"$XMLTO" != x || as_fn_error $? "Cannot find \`xmlto\` in PATH." "$LINENO" 5
   # Extract the first word of "gzip", so it can be a program name with args.
 set dummy gzip; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5