diff --git a/lib/scafacos/Install.py b/lib/scafacos/Install.py
index 8cfe8eb3f7..91ab10e099 100644
--- a/lib/scafacos/Install.py
+++ b/lib/scafacos/Install.py
@@ -55,6 +55,7 @@ if args.build == False and not args.path:
 
 buildflag = args.build
 pathflag = args.path != None
+version = args.version
 
 homepath = fullpath(".")
 scafacospath = "%s/scafacos-%s" % (homepath,version)
diff --git a/lib/smd/Install.py b/lib/smd/Install.py
index 0c33cb36ef..c0db3e9a38 100644
--- a/lib/smd/Install.py
+++ b/lib/smd/Install.py
@@ -6,8 +6,7 @@
 from __future__ import print_function
 import sys,os,re,glob,subprocess,shutil
 sys.path.append('..')
-from install_helpers import fullpath,geturl
-
+from install_helpers import fullpath,geturl,checkmd5sum
 from argparse import ArgumentParser
 
 parser = ArgumentParser(prog='Install.py',
@@ -26,7 +25,6 @@ checksums = { \
               '3.3.7' : 'f2a417d083fe8ca4b8ed2bc613d20f07' \
 }
 
-
 # help message
 
 help = """
@@ -63,6 +61,7 @@ eigenpath = "%s/eigen3" % homepath
 
 buildflag = args.build
 pathflag = args.path != None
+version = args.version
 
 if (pathflag):
   eigenpath = args.path
@@ -77,6 +76,13 @@ if buildflag:
   url = "http://bitbucket.org/eigen/eigen/get/%s.tar.gz" % version
   geturl(url,"%s/%s" % (homepath,tarball))
 
+  # verify downloaded archive integrity via md5 checksum, if known.
+  if version in checksums:
+    print("checking version %s\n" % version)
+    if not checkmd5sum(checksums[version],'%s/%s' % (homepath,tarball)):
+      sys.exit("Checksum for Eigen library does not match")
+
+
   print("Cleaning up old folders ...")
   edir = glob.glob("%s/eigen-eigen-*" % homepath)
   edir.append(eigenpath)