diff --git a/README.md b/README.md
index 59bdf7b..eba5566 100644
--- a/README.md
+++ b/README.md
@@ -15,4 +15,4 @@ This working directory is forked from the common code base, [ITF Base Devanagari
 ## Dependencies
 
 - [Adobe Font Development Kit for OpenType](http://www.adobe.com/devnet/opentype/afdko.html) (AFDKO), version 2.5 build 63209 (Sep 18 2014) or newer.
-- Extra Python [scripts](https://github.com/adobe-type-tools/python-scripts) and [modules](https://github.com/adobe-type-tools/python-modules) for AFDKO, to be placed in the directory `FDK/Tools/osx`.
+- A script [`UFOInstanceGenerator.py`](https://github.com/adobe-type-tools/python-scripts/blob/master/FDK%20Extras/UFOInstanceGenerator.py) (to be placed in AFDKO’s directory `FDK/Tools/osx`) and two [modules](https://github.com/adobe-type-tools/python-modules) (to be placed in Python’s `site-packages` directory) from Adobe.
diff --git a/build.py b/build.py
index 40995ce..660ed0c 100644
--- a/build.py
+++ b/build.py
@@ -1,6 +1,7 @@
 #!/usr/bin/python
 
 import argparse, sys, subprocess, os.path
+import WriteFeaturesMarkFDK
 
 import itf
 from config import (
@@ -25,8 +26,8 @@
     help='reset style/instance directories'
 )
 procedures.add_argument(
-    '-i', '--interpolate', action='store_true',
-    help='interpolate instances'
+    '-i', '--instance', action='store_true',
+    help='generate instances'
 )
 procedures.add_argument(
     '-m', '--match', action='store_true',
@@ -36,6 +37,10 @@
     '-c', '--compile', action='store_true',
     help='compile OTFs'
 )
+procedures.add_argument(
+    '--nointerpolate', action='store_true',
+    help='do not interpolate the masters'
+)
 
 if len(sys.argv) == 1:
     parser.print_help()
@@ -75,13 +80,53 @@
     print '#ITF: Done.\n'
 
 
-if args.interpolate:
+if args.instance:
+
+    masters = [
+        i for i in [
+            itf.get_font('masters', suffix) for suffix in ['_0', '_1']
+        ] if i
+    ]
+
+    if args.nointerpolate:
+
+        for font, style_name in zip(masters, STYLE_NAMES):
+
+            print "\n#ITF: %s" % style_name
+
+            style_dir = 'styles/' + style_name
+
+            subprocess.call([
+                'cp', '-fr', font.path,
+                style_dir + '/font.ufo'
+            ])
+
+            if '-mark' in UFOIG_ARGS:
+                WriteFeaturesMarkFDK.MarkDataClass(
+                    font = itf.get_font(style_dir),
+                    folderPath = style_dir,
+                    trimCasingTags = False,
+                    genMkmkFeature = True if '-mkmk' in UFOIG_ARGS else False,
+                    writeClassesFile = True if '-clas' in UFOIG_ARGS else False,
+                    indianScriptsFormat = True if '-indi' in UFOIG_ARGS else False
+                )
+
+            if '-flat' in UFOIG_ARGS:
+                print "#ITF: Flattening the glyphs..."
+                subprocess.Popen(
+                    ['checkoutlines', '-e', style_dir + '/font.ufo'],
+                    stderr=subprocess.STDOUT,
+                    stdout=subprocess.PIPE
+                ).communicate()
+                print "#ITF: Done."
+
+    else:
 
-    itf.fix_Glyphs_UFO_masters()
+        itf.fix_Glyphs_UFO_masters(masters)
 
-    subprocess.call(
-        ['UFOInstanceGenerator.py', 'masters', '-o', 'styles'] + UFOIG_ARGS
-    )
+        subprocess.call(
+            ['UFOInstanceGenerator.py', 'masters', '-o', 'styles'] + UFOIG_ARGS
+        )
 
 
 if args.match:
diff --git a/itf.py b/itf.py
index 13340e2..c2dbe31 100644
--- a/itf.py
+++ b/itf.py
@@ -40,14 +40,18 @@
 
 def get_font(directory, suffix = ''):
 
+    font_file_name = ''
+
     for file_name in os.listdir(directory):
         if file_name.endswith(suffix + ".ufo"):
             font_file_name = file_name
             break
-
-    font = robofab.world.OpenFont(directory + '/' + font_file_name)
-
-    return font
+    if font_file_name:
+        font = robofab.world.OpenFont(directory + '/' + font_file_name)
+        return font
+    else:
+        print "#ITF: Can't find the font file with suffix `%s`." % suffix
+        return None
 
 
 def sort_glyphs(glyphs):
@@ -136,9 +140,9 @@ def generate_classes(directory, suffix):
     print "#ITF: Done."
 
 
-def fix_Glyphs_UFO_masters():
+def fix_Glyphs_UFO_masters(masters):
 
-    for font in [get_font('masters', suffix) for suffix in ['_0', '_1']]:
+    for font in masters:
 
         if not font.info.postscriptFamilyBlues:
             font.info.postscriptFamilyBlues = []