diff --git a/setup/git_post_checkout_hook.py b/setup/git_post_checkout_hook.py
index 9aefa16bed..ca1eadff6c 100755
--- a/setup/git_post_checkout_hook.py
+++ b/setup/git_post_checkout_hook.py
@@ -6,7 +6,7 @@ from __future__ import (unicode_literals, division, absolute_import,
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 
-import os, subprocess, sys, shutil
+import os, subprocess, sys
 
 prev_rev, current_rev, flags = [x.decode('utf-8') if isinstance(x, bytes) else x for x in sys.argv[1:]]
 def get_branch_name(rev):
@@ -26,44 +26,3 @@ if flags == '1':  # A branch checkout
             if f.endswith('.pyc'):
                 os.remove(fpath)
 
-elif flags in ('master', 'qt5'):
-    cur_branch = get_branch_name('HEAD')
-    next_branch = flags
-    if cur_branch == next_branch:
-        print ('Already on branch', next_branch, file=sys.stderr)
-        raise SystemExit(1)
-    is_qt5_transition = 'qt5' in (next_branch, cur_branch)
-    print ('Transitioning from', cur_branch, 'to', next_branch)
-
-    if is_qt5_transition:
-        # Remove compiled .ui files as they must be re-generated
-        for dirpath, dirnames, filenames in os.walk('.'):
-            for f in filenames:
-                if f.endswith('_ui.py'):
-                    os.remove(os.path.join(dirpath, f))
-
-    subprocess.check_call(['git', 'checkout', next_branch])
-
-    if is_qt5_transition:
-        # Rebuild PyQt extensions
-        if not os.path.exists('.git/rebase-merge'):  # Dont rebuild if we are rebasing
-            for ext in ('progress_indicator', 'pictureflow', 'qt_hack'):
-                extdir = os.path.join('build', 'pyqt', ext)
-                if os.path.exists(extdir):
-                    shutil.rmtree(extdir)
-                subprocess.check_call(['python', 'setup.py', 'build', '--only', ext])
-
-    if next_branch == 'qt5':
-        for dirpath, dirnames, filenames in os.walk('.'):
-            for f in filenames:
-                fpath = os.path.join(dirpath, f)
-                if f.endswith('.py') and 'qtcurve' not in fpath and (b'PyQt' + b'4') in open(fpath, 'rb').read():
-                    red = ('\033[%dm'%31).encode('ascii')
-                    reset = ('\033[%dm'%31).encode('ascii')
-                    sys.stdout.write(red)
-                    print ('\nPyQt' + '4 present in:', fpath)
-                    sys.stdout.write(reset)
-        print ('\n')
-        subprocess.check_call(['python', 'setup/qt5-migrate.py'])
-
-