--- quex-0.65.4/quex-exe.py.old	2017-12-13 21:42:48.633280478 +0100
+++ quex-0.65.4/quex-exe.py	2017-12-13 21:43:02.066040530 +0100
@@ -40,11 +40,6 @@
     print("error: Please, use Python versions 2.x.")
     sys.exit(-1)
 
-if os.environ.has_key("QUEX_PATH") == False:
-    print("Environment variable QUEX_PATH has not been defined.")
-else:
-    sys.path.insert(0, os.environ["QUEX_PATH"])
-
 try:
     exception_checker.do_on_import(sys.argv)
     import quex.DEFINITIONS
--- quex-0.65.4/quex/DEFINITIONS.py.old	2017-12-13 21:48:52.887765325 +0100
+++ quex-0.65.4/quex/DEFINITIONS.py	2017-12-13 21:52:29.805877359 +0100
@@ -23,7 +23,7 @@
 QUEX_VERSION = '0.65.4'
 
 try:
-    QUEX_INSTALLATION_DIR = os.environ["QUEX_PATH"]
+    QUEX_INSTALLATION_DIR = "@PYTHON_SITEDIR@"
     # Note, that windows can also deal with backslashes.
     QUEX_INSTALLATION_DIR = QUEX_INSTALLATION_DIR.replace("\\", "/")
 except:
@@ -49,15 +49,14 @@
     sys.exit(-1) # sys.exit(-1) is acceptable
 
 QUEX_PATH          = QUEX_INSTALLATION_DIR
-QUEX_CODEC_DB_PATH = QUEX_PATH + "/quex/engine/codec_db/database"
+QUEX_CODEC_DB_PATH = "/usr/share/quex/database"
 
-sys.path.insert(0, QUEX_INSTALLATION_DIR)
 
 def check():
     global QUEX_INSTALLATION_DIR
 
     # -- Try to acces the file 'quex-exe.py' in order to verify
-    if os.access(QUEX_INSTALLATION_DIR + "/quex-exe.py", os.F_OK) == False:
+    if False:
         print "error: Environment variable 'QUEX_PATH' does not point to"
         print "error: a valid installation directory of quex."
         print "error: current setting of 'QUEX_PATH':"