How to get the concated characters in Indic languages like Gujarati/Hindi?

[Kaushal Modi <kaushal.modi@gmail.com>]

Hello,

I was browsing the etc/HELLO, and saw that "Namaste" in Gujarati is shown
as 4 separate characters instead of (for a lack of better way to express
this) 3.5 characters.

I see: "ન" (1), "મ" (1), "સ્" (1), "તે " (1 - I know that this is
technically not 1 char).

It should be seen as: "ન" (1), "મ" (1), "સ્તે " (1.5)

[And the same for Hindi नमस्ते too.]

I have built Emacs for the latest master and it's built with LIBOTF and
M17N_FLT features:

Emacs version: GNU Emacs 27.0.50 (build 4, x86_64-pc-linux-gnu, GTK+
Version 2.24.23)
 of 2018-08-13, built using commit eb787d749f28583906428269b926fa83aef092b9.

./configure options:
  --with-modules --prefix=/home/kmodi/usr_local/apps/6/emacs/master
'--program-transform-name=s/^ctags$/ctags_emacs/'
--enable-checking=yes,glyphs --enable-check-lisp-object-type
'CPPFLAGS=-I/home/kmodi/stowed/include -I/home/kmodi/usr_local/6/include
-I/usr/include/freetype2 -I/usr/include' 'CFLAGS=-ggdb3 -O0'
'CXXFLAGS=-ggdb3 -O0' 'LDFLAGS=-L/home/kmodi/stowed/lib
-L/home/kmodi/stowed/lib64 -L/home/kmodi/usr_local/6/lib
-L/home/kmodi/usr_local/6/lib64 -ggdb3'

Features:
  XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK2 X11 MODULES THREADS GMP

- Is there any missing library that's causing this?
-- 

Kaushal Modi