diff --git a/src/tdedistutils.py b/src/tdedistutils.py
index 9515010..fa14021 100644
--- a/src/tdedistutils.py
+++ b/src/tdedistutils.py
@@ -637,6 +637,8 @@ class BuildKControlModule(Command):
             self.announce("Using %s for Python header files" % self.python_inc_dir)
 
             # PyQt dir
+            if self.pyqt_dir is None:
+                self.pyqt_dir = FindFileInPaths("python_tqt", sys.path)
             if self.pyqt_dir is None:
                 self.pyqt_dir = os.path.join(sysconfig.get_python_lib(), 'python_tqt')
             if (FindFileInPaths("libqtcmodule*",[self.pyqt_dir]) is None) and (FindFileInPaths("qt*",[self.pyqt_dir]) is None):
@@ -651,6 +653,8 @@ class BuildKControlModule(Command):
             self.announce("Using %s for PyTDE modules" % self.pytde_dir)
 
             # Sip dir
+            if self.sip_dir is None:
+                self.sip_dir = FindFileInPaths("sip4_tqt", sys.path)
             if self.sip_dir is None:
                 self.sip_dir = os.path.join(sysconfig.get_python_lib(), 'sip4_tqt')
             if (FindFileInPaths("libsip*", [self.sip_dir]) is None) and (FindFileInPaths("sip*", [self.sip_dir]) is None):
@@ -1588,6 +1592,8 @@ class BuildTdeioslave(Command):
             self.announce("Using %s for Python header files" % self.python_inc_dir)
 
             # PyQt dir
+            if self.pyqt_dir is None:
+                self.pyqt_dir = FindFileInPaths("python_tqt", sys.path)
             if self.pyqt_dir is None:
                 self.pyqt_dir = os.path.join(sysconfig.get_python_lib(), 'python_tqt')
             if (FindFileInPaths("libqtcmodule*",[self.pyqt_dir]) is None) and (FindFileInPaths("qt*",[self.pyqt_dir]) is None):
@@ -1602,6 +1608,8 @@ class BuildTdeioslave(Command):
             self.announce("Using %s for PyTDE modules" % self.pytde_dir)
 
             # Sip dir
+            if self.sip_dir is None:
+                self.sip_dir = FindFileInPaths("sip4_tqt", sys.path)
             if self.sip_dir is None:
                 self.sip_dir = os.path.join(sysconfig.get_python_lib(), 'sip4_tqt')
             if (FindFileInPaths("libsip*", [self.sip_dir]) is None) and (FindFileInPaths("sip*", [self.sip_dir]) is None):