diff --git a/Mac/Include/macglue.h b/Mac/Include/macglue.h
index 7c074d3..89d10d1 100644
--- a/Mac/Include/macglue.h
+++ b/Mac/Include/macglue.h
@@ -2,11 +2,15 @@
 #include <Types.h>
 #include <Resources.h>
 
-char *macstrerror PROTO((int));			/* strerror with mac errors */
-object *PyErr_Mac PROTO((object *, int));	/* Exception with a mac error */
-int PyMac_Idle PROTO((void));			/* Idle routine */
-int GetOSType PROTO((object *, ResType *));	/* argument parser for OSType */
-int GetStr255 PROTO((object *, Str255));	/* argument parser for Str255 */
-int GetFSSpec PROTO((object *, FSSpec *));	/* argument parser for FSSpec */
-object *PyMac_BuildFSSpec PROTO((FSSpec *));	/* Convert FSSpec to python object */
+char *macstrerror Py_PROTO((int));			/* strerror with mac errors */
+PyObject *PyErr_Mac Py_PROTO((PyObject *, int));	/* Exception with a mac error */
+int PyMac_Idle Py_PROTO((void));			/* Idle routine */
+int PyMac_GetOSType Py_PROTO((PyObject *, ResType *));	/* argument parser for OSType */
+int PyMac_GetStr255 Py_PROTO((PyObject *, Str255));	/* argument parser for Str255 */
+int PyMac_GetFSSpec Py_PROTO((PyObject *, FSSpec *));	/* argument parser for FSSpec */
+PyObject *PyMac_BuildFSSpec Py_PROTO((FSSpec *));	/* Convert FSSpec to PyObject */
+PyObject *PyMac_BuildOSType Py_PROTO((OSType));		/* Convert OSType to PyObject */
 
+#define GetOSType PyMac_GetOSType
+#define GetStr255 PyMac_GetStr255
+#define GetFSSpec PyMac_GetFSSpec
diff --git a/Mac/Python/macglue.c b/Mac/Python/macglue.c
index 76e96a8..741e985 100644
--- a/Mac/Python/macglue.c
+++ b/Mac/Python/macglue.c
@@ -63,10 +63,12 @@
 	char *msg;
 	PyObject *v;
 	
-	if (err == 0) {
+	if (err == 0 && !PyErr_Occurred()) {
 		Py_INCREF(Py_None);
 		return Py_None;
 	}
+	if (err == -1 && PyErr_Occurred())
+		return NULL;
 	msg = macstrerror(err);
 	v = Py_BuildValue("(is)", err, msg);
 	PyErr_SetObject(eobj, v);
@@ -102,7 +104,7 @@
 
 /* Convert a ResType argument */
 int
-GetOSType(PyObject *v, ResType *pr)
+PyMac_GetOSType(PyObject *v, ResType *pr)
 {
 	if (!PyString_Check(v) || PyString_Size(v) != 4) {
 		PyErr_SetString(PyExc_TypeError,
@@ -115,7 +117,7 @@
 
 /* Convert a Str255 argument */
 int
-GetStr255(PyObject *v, Str255 pbuf)
+PyMac_GetStr255(PyObject *v, Str255 pbuf)
 {
 	int len;
 	if (!PyString_Check(v) || (len = PyString_Size(v)) > 255) {
@@ -136,7 +138,7 @@
 ** this is probably sys7 dependent anyway).
 */
 int
-GetFSSpec(PyObject *v, FSSpec *fs)
+PyMac_GetFSSpec(PyObject *v, FSSpec *fs)
 {
 	Str255 path;
 	short refnum;
@@ -172,3 +174,10 @@
 {
 	return Py_BuildValue("(iis#)", fs->vRefNum, fs->parID, &fs->name[1], fs->name[0]);
 }
+
+/* Convert an OSType value to a 4-char string object */
+PyObject *
+PyMac_BuildOSType(OSType t)
+{
+	return PyString_FromStringAndSize((char *)&t, 4);
+}