Split the requirements list into two lists, load install_requires list from one of them.

(cherry picked from commit 4b3f422806)

requirements.txt

@@ -1,14 +1 @@
-# Phoenix build and test requirements
-appdirs
-setuptools
-six
-wheel
-twine
-sphinx
-requests
-pytest
-pytest-xdist
-pytest-timeout
-numpy
-pillow
-pathlib2
+-r requirements/devel.txt

requirements/devel.txt

@@ -0,0 +1,12 @@
+# Python packages needed for building and testing wxPython Phoenix
+-r install.txt
+appdirs
+setuptools
+wheel
+twine
+sphinx
+requests
+pytest
+pytest-xdist
+pytest-timeout
+pathlib2

requirements/install.txt

@@ -0,0 +1,4 @@
+# Runtime dependencies needed when using wxPython Phoenix
+numpy
+pillow
+six

setup.py

@@ -89,9 +89,9 @@ Programming Language :: Python :: Implementation :: CPython
 Topic :: Software Development :: User Interfaces
 """
 
-DEPENDENCIES = [ 'six',
-                 'Pillow',
-                 ]
+INSTALL_REQUIRES = [line.strip()
+                    for line in open('requirements/install.txt').readlines()
+                    if not line.startswith('#')]
 
 isWindows = sys.platform.startswith('win')
 isDarwin = sys.platform == "darwin"
@@ -356,7 +356,7 @@ if __name__ == '__main__':
           platforms        = PLATFORMS,
           classifiers      = [c for c in CLASSIFIERS.split("\n") if c],
           keywords         = KEYWORDS,
-          install_requires = DEPENDENCIES,
+          install_requires = INSTALL_REQUIRES,
           zip_safe         = False,
           use_2to3         = False,
           include_package_data = True,