Diff below backports a commit so libxml can be built under python 3.9.

ok?

Index: Makefile
===================================================================
RCS file: /cvs/ports/textproc/libxml/Makefile,v
retrieving revision 1.188
diff -u -p -u -r1.188 Makefile
--- Makefile    12 May 2021 11:22:35 -0000      1.188
+++ Makefile    13 May 2021 12:30:47 -0000
@@ -5,7 +5,7 @@ COMMENT-python=         Python bindings for lib
 
 VERSION=               2.9.10
 REVISION-main=         4
-REVISION-python=       5
+REVISION-python=       6
 DISTNAME=              libxml2-${VERSION}
 PKGNAME-main=          libxml-${VERSION}
 PKGNAME-python=                py3-libxml-${VERSION}
Index: patches/patch-python_libxml_c
===================================================================
RCS file: /cvs/ports/textproc/libxml/patches/patch-python_libxml_c,v
retrieving revision 1.1
diff -u -p -u -r1.1 patch-python_libxml_c
--- patches/patch-python_libxml_c       10 Jun 2020 22:54:58 -0000      1.1
+++ patches/patch-python_libxml_c       13 May 2021 12:30:47 -0000
@@ -2,9 +2,29 @@ $OpenBSD: patch-python_libxml_c,v 1.1 20
 
 https://gitlab.gnome.org/GNOME/libxml2/-/issues/64
 
+Backport commit e4fb3684 for python 3.9 support
+
 Index: python/libxml.c
 --- python/libxml.c.orig
 +++ python/libxml.c
+@@ -294,7 +294,7 @@ xmlPythonFileReadRaw (void * context, char * buffer, i
+       lenread = PyBytes_Size(ret);
+       data = PyBytes_AsString(ret);
+ #ifdef PyUnicode_Check
+-    } else if PyUnicode_Check (ret) {
++    } else if (PyUnicode_Check (ret)) {
+ #if PY_VERSION_HEX >= 0x03030000
+         Py_ssize_t size;
+       const char *tmp;
+@@ -359,7 +359,7 @@ xmlPythonFileRead (void * context, char * buffer, int 
+       lenread = PyBytes_Size(ret);
+       data = PyBytes_AsString(ret);
+ #ifdef PyUnicode_Check
+-    } else if PyUnicode_Check (ret) {
++    } else if (PyUnicode_Check (ret)) {
+ #if PY_VERSION_HEX >= 0x03030000
+         Py_ssize_t size;
+       const char *tmp;
 @@ -1620,6 +1620,7 @@ libxml_xmlErrorFuncHandler(ATTRIBUTE_UNUSED void *ctx,
      PyObject *message;
      PyObject *result;
Index: patches/patch-python_types_c
===================================================================
RCS file: patches/patch-python_types_c
diff -N patches/patch-python_types_c
--- /dev/null   1 Jan 1970 00:00:00 -0000
+++ patches/patch-python_types_c        13 May 2021 12:30:47 -0000
@@ -0,0 +1,53 @@
+$OpenBSD$
+
+Backport commit e4fb3684 for python 3.9 support
+
+Index: python/types.c
+--- python/types.c.orig
++++ python/types.c
+@@ -602,16 +602,16 @@ libxml_xmlXPathObjectPtrConvert(PyObject *obj)
+     if (obj == NULL) {
+         return (NULL);
+     }
+-    if PyFloat_Check (obj) {
++    if (PyFloat_Check (obj)) {
+         ret = xmlXPathNewFloat((double) PyFloat_AS_DOUBLE(obj));
+-    } else if PyLong_Check(obj) {
++    } else if (PyLong_Check(obj)) {
+ #ifdef PyLong_AS_LONG
+         ret = xmlXPathNewFloat((double) PyLong_AS_LONG(obj));
+ #else
+         ret = xmlXPathNewFloat((double) PyInt_AS_LONG(obj));
+ #endif
+ #ifdef PyBool_Check
+-    } else if PyBool_Check (obj) {
++    } else if (PyBool_Check (obj)) {
+ 
+         if (obj == Py_True) {
+           ret = xmlXPathNewBoolean(1);
+@@ -620,14 +620,14 @@ libxml_xmlXPathObjectPtrConvert(PyObject *obj)
+           ret = xmlXPathNewBoolean(0);
+         }
+ #endif
+-    } else if PyBytes_Check (obj) {
++    } else if (PyBytes_Check (obj)) {
+         xmlChar *str;
+ 
+         str = xmlStrndup((const xmlChar *) PyBytes_AS_STRING(obj),
+                          PyBytes_GET_SIZE(obj));
+         ret = xmlXPathWrapString(str);
+ #ifdef PyUnicode_Check
+-    } else if PyUnicode_Check (obj) {
++    } else if (PyUnicode_Check (obj)) {
+ #if PY_VERSION_HEX >= 0x03030000
+         xmlChar *str;
+       const char *tmp;
+@@ -650,7 +650,7 @@ libxml_xmlXPathObjectPtrConvert(PyObject *obj)
+       ret = xmlXPathWrapString(str);
+ #endif
+ #endif
+-    } else if PyList_Check (obj) {
++    } else if (PyList_Check (obj)) {
+         int i;
+         PyObject *node;
+         xmlNodePtr cur;

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