diff --git a/install-deps b/install-deps
index deba886..d5ec45b 100755
--- a/install-deps
+++ b/install-deps
@@ -38,7 +38,9 @@ if not os.path.exists(numpy_src.replace('.tar.gz', '')):
 if not os.path.exists('PythonPackages/FuncDesigner'):
     Popen(['unzip', funcdesigner_src]).wait()
 
-if not os.path.exists('/usr/local/lib/python2.7/dist-packages/numpy'):
+try:
+    exec 'import numpy'
+except:
     indirdo('numpy-%s' % NUMPY_VER, lambda:
         Popen(['sudo', 'python', 'setup.py', 'install']).wait())
 
@@ -47,3 +49,8 @@ try:
 except:
     indirdo('PythonPackages/FuncDesigner', lambda:
             Popen(['sudo', 'python', 'setup.py', 'install']).wait())
+
+try:
+    exec 'import gtkgl'
+except:
+    Popen(['sudo', 'apt-get', 'install', 'python-gtkglext1']).wait()