diff --git a/common/makestub.py b/common/makestub.py
new file mode 100755
index 0000000..a5334d7
--- /dev/null
+++ b/common/makestub.py
@@ -0,0 +1,122 @@
+#!/usr/bin/env python3
+#
+#-------------------------------------------------------------------
+#  makestub.py
+#
+# Read a CDL or SPICE netlist and remove all contents from subcircuits,
+# leaving only the .SUBCKT ... .ENDS wrapper.  Used as a filter, so it
+# replaces the original file with the modified one.  If the original
+# file is a symbolic link, then it is first unlinked and replaced with
+# the new contents.
+#
+# Use:
+#
+# 	makestub.py <path_to_netlist_file>
+#
+#-------------------------------------------------------------------
+
+import os
+import re
+import sys
+import stat
+import textwrap
+
+def makeuserwritable(filepath):
+    if os.path.exists(filepath):
+        st = os.stat(filepath)
+        os.chmod(filepath, st.st_mode | stat.S_IWUSR)
+
+def generate_stubs(netlist_path, output_path):
+    netlist_dir = os.path.split(netlist_path)[0]
+    netlist_filename = os.path.split(netlist_path)[1]
+    netlist_root = os.path.splitext(netlist_filename)[0]
+    netlist_ext = os.path.splitext(netlist_filename)[1]
+
+    if not os.path.exists(netlist_path):
+        print('Error:  Specified file "' + netlist_path + '" does not exist!')
+        return
+
+    if output_path == None:
+        output_path = netlist_path
+
+    with open(netlist_path, 'r') as ifile:
+        spicetext = ifile.read().splitlines()
+
+    # Remove blank lines and comment lines
+    spicelines = []
+    for line in spicetext:
+        if len(line) > 0:
+            if line[0] != '*':
+                spicelines.append(line)
+
+    # Remove line extensions
+    spicetext = '\n'.join(spicelines)
+    spicelines = spicetext.replace('\n+', ' ').splitlines()
+
+    # SPICE subcircuit definition:
+    subcrex = re.compile(r'[ \t]*\.subckt[ \t]+([^ \t]+)[ \t]+(.*)$', re.IGNORECASE)
+    endsrex = re.compile(r'[ \t]*\.ends[ \t]*', re.IGNORECASE)
+
+    spiceoutlines = []
+
+    insub = False
+    for line in spicelines:
+        if insub:
+            ematch = endsrex.match(line)
+            if ematch:
+                insub = False
+                spiceoutlines.append(line)
+        else:
+            smatch = subcrex.match(line)
+            if smatch:
+                insub = True
+                spiceoutlines.append('')
+                spiceoutlines.append('*----------------------------------------------')
+                spiceoutlines.append('* SPICE stub entry for ' + smatch.group(1) + '.')
+                spiceoutlines.append('*----------------------------------------------')
+                spiceoutlines.append('')
+            spiceoutlines.append(line)
+
+    if output_path == netlist_path:
+        if os.path.islink(netlist_path):
+            os.unlink(netlist_path)
+
+    # Re-wrap continuation lines at 100 characters
+    wrappedlines = []
+    for line in spiceoutlines:
+        wrappedlines.append('\n+ '.join(textwrap.wrap(line, 100)))
+
+    # Just in case the file in the source repo is not user-writable
+    if os.path.exists(output_path):
+        makeuserwritable(output_path)
+
+    with open(output_path, 'w') as ofile:
+        for line in wrappedlines:
+            print(line, file=ofile)
+
+# If called as main, run generate_stubs
+
+if __name__ == '__main__':
+
+    # Divide up command line into options and arguments
+    options = []
+    arguments = []
+    for item in sys.argv[1:]:
+        if item.find('-', 0) == 0:
+            options.append(item)
+        else:
+            arguments.append(item)
+
+    # Need one argument:  path to CDL or SPICE netlist
+    # If two arguments, then 2nd argument is the output file.
+
+    if len(arguments) == 2:
+        netlist_path = arguments[0]
+        output_path = arguments[1]
+        generate_stubs(netlist_path, output_path)
+    elif len(arguments) != 1:
+        print("Usage:  makestub.py <file_path> [<output_path>]")
+    elif len(arguments) == 1:
+        netlist_path = arguments[0]
+        generate_stubs(netlist_path, None)
+