Issue #16061: Speed up str.replace() for replacing 1-character strings.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 534ddc0..ab56e3f 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -726,6 +726,7 @@
 		$(srcdir)/Objects/stringlib/find_max_char.h \
 		$(srcdir)/Objects/stringlib/localeutil.h \
 		$(srcdir)/Objects/stringlib/partition.h \
+		$(srcdir)/Objects/stringlib/replace.h \
 		$(srcdir)/Objects/stringlib/split.h \
 		$(srcdir)/Objects/stringlib/ucs1lib.h \
 		$(srcdir)/Objects/stringlib/ucs2lib.h \