Include SQLite3 source upon buildworld

Hi,

There's an SQLite3 source located in the /usr/src/contrib/sqlite3. Is there
a way to include this upon buildworld so that I can run the binary after
compiling?

freebsd@generic:/usr/src/contrib/sqlite3 % pwd
/usr/src/contrib/sqlite3

freebsd@generic:/usr/src/contrib/sqlite3 % ls -lah
total 11364
drwxr-xr-x   3 root  wheel   1.0K Oct 27 00:06 .
drwxr-xr-x  88 root  wheel   2.0K Oct 27 00:06 ..
-rw-r--r--   1 root  wheel    15K Oct 27 00:06 INSTALL
-rw-r--r--   1 root  wheel   729B Oct 27 00:06 Makefile.am
-rw-r--r--   1 root  wheel   547B Oct 27 00:06 Makefile.fallback
-rw-r--r--   1 root  wheel    37K Oct 27 00:06 Makefile.in
-rw-r--r--   1 root  wheel    28K Oct 27 00:06 Makefile.msc
-rw-r--r--   1 root  wheel   3.5K Oct 27 00:06 README.txt
-rw-r--r--   1 root  wheel   7.1K Oct 27 00:06 Replace.cs
-rw-r--r--   1 root  wheel   365K Oct 27 00:06 aclocal.m4
-rwxr-xr-x   1 root  wheel   7.2K Oct 27 00:06 compile
-rwxr-xr-x   1 root  wheel    48K Oct 27 00:06 config.guess
-rwxr-xr-x   1 root  wheel    35K Oct 27 00:06 config.sub
-rwxr-xr-x   1 root  wheel   485K Oct 27 00:06 configure
-rw-r--r--   1 root  wheel   8.5K Oct 27 00:06 configure.ac
-rwxr-xr-x   1 root  wheel    23K Oct 27 00:06 depcomp
-rwxr-xr-x   1 root  wheel    15K Oct 27 00:06 install-sh
-rwxr-xr-x   1 root  wheel   320K Oct 27 00:06 ltmain.sh
-rwxr-xr-x   1 root  wheel   6.7K Oct 27 00:06 missing
-rw-r--r--   1 root  wheel   717K Oct 27 00:06 shell.c
-rw-r--r--   1 root  wheel   8.7K Oct 27 00:06 sqlite3.1
-rw-r--r--   1 root  wheel   8.2M Oct 27 00:06 sqlite3.c
-rw-r--r--   1 root  wheel   599K Oct 27 00:06 sqlite3.h
-rw-r--r--   1 root  wheel   267B Oct 27 00:06 sqlite3.pc.in
-rw-r--r--   1 root  wheel   1.9K Oct 27 00:06 sqlite3.rc
-rw-r--r--   1 root  wheel    36K Oct 27 00:06 sqlite3ext.h
-rw-r--r--   1 root  wheel    78B Oct 27 00:06 sqlite3rc.h
drwxr-xr-x   6 root  wheel   512B Oct 27 00:06 tea

Thanks and best regards,
Archimedes