Ok, in that case, this is what I'd do:
# cd apache_1.3.27
# config.layout --enable-module=headers --enable-shared=headers
# make
# make install
Then edit httpd.conf and add these lines in the correct places:
LoadModule headers_module libexec/mod_headers.so
AddModule mod_headers.c
If you already have mod_expires as a loaded module, then add each of those two lines below the corresponding lines for mod_expires, like this:
LoadModule expires_module libexec/mod_expires.so
LoadModule headers_module libexec/mod_headers.so
.
.
.
AddModule mod_expires.c
AddModule mod_headers.c
and restart Apache.
Someone please confirm.