/usr/share/doc/libsasl2-2/README.configure-options is in libsasl2-2 2.1.25.dfsg1-6+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | To build this package, configure was called as follows:
configure $ac_cs_config
|