fixup build for osgeo4w

setup.py

@@ -1,5 +1,6 @@
 from distutils.core import setup, Extension
 import sys
+import os
 
 # to avoid compilation warning
 import distutils.sysconfig
@@ -8,16 +9,23 @@
     if type(value) == str:
         cfg_vars[key] = value.replace("-Wstrict-prototypes", "").replace("-DNDEBUG", "-DDEBUG")
 
+path_separator = ":" if os.name == "posix" else ";"
+cgal = "CGAL" if "CGAL_LIBNAME" not in os.environ else os.environ["CGAL_LIBNAME"]
+gmp = "gmp"  if "GMP_LIBNAME" not in os.environ else os.environ["GMP_LIBNAME"]
+mpfr = "mpfr"  if "MPFR_LIBNAME" not in os.environ else os.environ["MPFR_LIBNAME"]
+boost_python = 'boost_python-py{}{}'.format(*sys.version_info[:2]) if "BOOSTPYTHON_LIBNAME" not in os.environ else os.environ["BOOSTPYTHON_LIBNAME"]
+
 mymodule = Extension('fourmy._fourmy',
                     define_macros = [('MAJOR_VERSION', '1'),
                                      ('MINOR_VERSION', '0')],
-                    include_dirs = ['/usr/local/include'],
-                    libraries = ['CGAL', 'gmp', 'mpfr', 'boost_python-py{}{}'.format(*sys.version_info[:2])],
+                    include_dirs = [] if "INCLUDE_PATH" not in os.environ else os.environ["INCLUDE_PATH"].split(path_separator),
+                    library_dirs = [] if "LIBRARY_PATH" not in os.environ else os.environ["LIBRARY_PATH"].split(path_separator),
+                    libraries = [cgal, gmp, mpfr, boost_python],
 
                     sources = ['fourmy/_fourmy.cc'])
 
 setup (name = 'fourmy',
-       version = '0.1',
+       version = '0.0.1',
        description = 'Some functions from CGAL for GIS, it does not aim to become full CGAL bindings. The interface is modeled after shapely.',
        ext_modules = [mymodule],
        packages=['fourmy'])