(Answer) (Category) OpenLDAP Faq-O-Matic : (Category) OpenLDAP Developer's FAQ : (Category) Porting OpenLDAP : (Category) Porting to Cygwin : (Answer) Running configure
After installing POSIX regex, you can successfully run configure! 

  $ LIBS=-lgnuregex ./configure --disable-ldbm --enable-ldap \
       --enable-passwd --enable-shell

Configure options are now (OpenLDAP 2.1.12) :
./configure --disable-bdb --enable-ldap --enable-passwd --enable-shell --without-threads
For OpenLDAP 2.20.0 on Cygwin I also had to add the following to enable the LDBM database backend:
--enable-ldbm
Sorry, in the last comment I meant version 2.1.20.
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