Rework wscript for algos' metadata (3)

src/python/wscript

@@ -78,7 +78,12 @@ def create_algo_metadata(task):
     else:
         ldpath = "../build/src"
 
-    # TODO Use DYLD_LIBRARY_PATH on MacOS
+    if sys.platform.startswith('linux'):
+        ldpath_varname = 'LD_LIBRARY_PATH'
+    elif sys.platform == 'darwin':
+        ldpath_varname = 'DYLD_LIBRARY_PATH'
+    #TODO win32
+
     command = """
 echo "Precompute algorithms' help metadata (__doc__ and __struct__)"
 echo `pwd`
@@ -90,8 +95,8 @@ cp -r ../src/python/essentia ../build/python/
 cp ../build/src/python/_essentia*.so ../build/python/essentia/
 #cp %s/libessentia.{so,a} ../build/python/essentia/
 
-PYTHONPATH=../build/python LD_LIBRARY_PATH=%s %s -c '%s'
+PYTHONPATH=../build/python %s=%s %s -c '%s'
 set +x
 echo "Algorithms' metadata created"
-""" % (ldpath, ldpath, ldpath, sys.executable, python_code)
+""" % (ldpath, ldpath, ldpath_varname, ldpath, sys.executable, python_code)
     task.exec_command(command)