https://gitlab.com/libidn/libidn2/commit/204dd34f2ce95b71a7f56ffe97b9019fb91db49c

--- libidn2-2.0.3/configure.ac		2017-07-24 10:53:59.000000000 +0200
+++ libidn2-2.0.3/configure.ac.docs	2017-08-01 00:27:44.000000000 +0200
@@ -95,17 +95,6 @@
     enable_doc=$enableval, enable_doc=yes)
 AM_CONDITIONAL(ENABLE_DOC, test "$enable_doc" != "no")
 
-if test "$enable_doc" = "yes"; then
-  AC_CHECK_PROG([RONN], [ronn], [ronn], [:])
-  if test "$ac_cv_prog_RONN" = ":"; then
-    AC_MSG_ERROR([You need the 'ronn' tool to generate the idn2.1 man page])
-  fi
-  AC_CHECK_PROG([MAKEINFO], [makeinfo], [makeinfo], [:])
-  if test "$ac_cv_prog_MAKEINFO" = ":"; then
-    AC_MSG_ERROR([You need the 'makeinfo' tool to generate the info pages])
-  fi
-fi
-
 if test "$ac_cv_libunistring" = "yes";then
 	AC_SEARCH_LIBS(uc_joining_type, unistring, [], [ac_cv_libunistring=no])
 fi
--- libidn2-2.0.3/configure		2017-07-24 11:05:20.000000000 +0200
+++ libidn2-2.0.3/configure.docs	2017-08-01 00:28:21.000000000 +0200
@@ -28283,92 +28283,6 @@
   ENABLE_DOC_FALSE=
 fi
 
-
-if test "$enable_doc" = "yes"; then
-  # Extract the first word of "ronn", so it can be a program name with args.
-set dummy ronn; ac_word=$2
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
-$as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_RONN+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test -n "$RONN"; then
-  ac_cv_prog_RONN="$RONN" # Let the user override the test.
-else
-as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-    for ac_exec_ext in '' $ac_executable_extensions; do
-  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_RONN="ronn"
-    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
-    break 2
-  fi
-done
-  done
-IFS=$as_save_IFS
-
-  test -z "$ac_cv_prog_RONN" && ac_cv_prog_RONN=":"
-fi
-fi
-RONN=$ac_cv_prog_RONN
-if test -n "$RONN"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $RONN" >&5
-$as_echo "$RONN" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-fi
-
-
-  if test "$ac_cv_prog_RONN" = ":"; then
-    as_fn_error $? "You need the 'ronn' tool to generate the idn2.1 man page" "$LINENO" 5
-  fi
-  # Extract the first word of "makeinfo", so it can be a program name with args.
-set dummy makeinfo; ac_word=$2
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
-$as_echo_n "checking for $ac_word... " >&6; }
-if ${ac_cv_prog_MAKEINFO+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test -n "$MAKEINFO"; then
-  ac_cv_prog_MAKEINFO="$MAKEINFO" # Let the user override the test.
-else
-as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-    for ac_exec_ext in '' $ac_executable_extensions; do
-  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_prog_MAKEINFO="makeinfo"
-    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
-    break 2
-  fi
-done
-  done
-IFS=$as_save_IFS
-
-  test -z "$ac_cv_prog_MAKEINFO" && ac_cv_prog_MAKEINFO=":"
-fi
-fi
-MAKEINFO=$ac_cv_prog_MAKEINFO
-if test -n "$MAKEINFO"; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $MAKEINFO" >&5
-$as_echo "$MAKEINFO" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-fi
-
-
-  if test "$ac_cv_prog_MAKEINFO" = ":"; then
-    as_fn_error $? "You need the 'makeinfo' tool to generate the info pages" "$LINENO" 5
-  fi
-fi
-
 if test "$ac_cv_libunistring" = "yes";then
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing uc_joining_type" >&5
 $as_echo_n "checking for library containing uc_joining_type... " >&6; }