Log Message:
Version 1.12, 2016-05-16

* New configuration variable COMPATINCLUDEDIR

When used with --enable-libgdbm-compat, this variable points to the
directory where the headers file dbm.h and ndbm.h will be installed.
Use this variable to avoid conflicts with already installed headers.
E.g.:

 ./configure --enable-libgdbm-compat COMPATINCLUDEDIR=/usr/include/gdbm