Install xml/parsers, not xml/parser.
diff --git a/Makefile.in b/Makefile.in
index aa7cf8d..b80cc2f 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -262,7 +262,7 @@
# Install the library
PLATDIR= plat-$(MACHDEP)
MACHDEPS= $(PLATDIR)
-XMLLIBSUBDIRS= xml xml/dom xml/parser xml/sax
+XMLLIBSUBDIRS= xml xml/dom xml/parsers xml/sax
LIBSUBDIRS= lib-old lib-tk site-packages test test/output encodings \
distutils distutils/command $(XMLLIBSUBDIRS) curses $(MACHDEPS)
libinstall: python $(srcdir)/Lib/$(PLATDIR)