Note: this is the third version of this patch.

Apply by doing
       cd /usr/src/usr.sbin/httpd/src
       patch -p0 < userdir.patch

And then rebuild httpd by doing
       cd /usr/src/usr.sbin/httpd
       make clean && make && make install

Index: Configuration
===================================================================
RCS file: /cvs/src/usr.sbin/httpd/src/Configuration,v
retrieving revision 1.2
retrieving revision 1.3
diff -u -r1.2 -r1.3
--- Configuration       1998/10/01 17:29:04     1.2
+++ Configuration       1998/11/15 00:14:32     1.3
@@ -288,7 +288,7 @@
## The UserDir module for selecting resource directories by user name
## and a common prefix, e.g., /~<user> , /usr/web/<user> , etc.

-# AddModule modules/standard/mod_userdir.o
+AddModule modules/standard/mod_userdir.o

## The proxy module enables the server to act as a proxy for outside
## http and ftp services. It's not as complete as it could be yet.