[pygobject] Fix macOS pipenv installation instructions

[Christoph Reiter <creiter src gnome org>]

commit af3bf5fcec02da7889a659b0aec4880712ed079e
Author: Dan Yeaw <dan yeaw me>
Date:   Thu Mar 8 22:37:47 2018 -0500

    Fix macOS pipenv installation instructions
    
    Signed-off-by: Dan Yeaw <dan yeaw me>

 docs/devguide/dev_environ.rst | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)
---
diff --git a/docs/devguide/dev_environ.rst b/docs/devguide/dev_environ.rst
index f18ebf5e..d94abf48 100644
--- a/docs/devguide/dev_environ.rst
+++ b/docs/devguide/dev_environ.rst
@@ -199,10 +199,21 @@ Items->System->Advanced System Setttings->Environment Variables
 |macosx-logo| macOS
 -------------------
 
+With homebrew:
+
 .. code:: console
 
-    brew install pyenv
-    pyenv install 3.6.4
+    brew install pipenv
+
+With pipsi:
+
+.. code:: console
+
+    curl https://raw.githubusercontent.com/mitsuhiko/pipsi/master/get-pipsi.py | python3 - 
--src=git+https://github.com/mitsuhiko/pipsi.git\#egg=pipsi
+    echo 'export PATH="$HOME/.local/bin:$PATH"' >> ~/.bashrc
+    source ~/.bashrc
+    pipsi install pew
+    pipsi install pipenv
 
 
 .. _projects-pygobject-dependencies: