If you use automake you could add the following code to tools/Makefile.am:
install-data-local: mkdir -p $(localstatedir)/stunnel -chmod a=rwx,+t $(localstatedir)/stunnel mkdir -p $(localstatedir)/stunnel/dev -chmod u=rwx,go=rx $(localstatedir)/stunnel/dev -uname | grep SunOS && mknod $(localstatedir)/stunnel/dev/zero c 13 12 -chmod a=rw $(localstatedir)/stunnel/dev/zero
Update your Makefile with automake and ./configure.
chroot directory should be set to /usr/local/var/stunnel instead of /usr/local/var/run/stunnel.
Best regards, Mike