Hmm, suspect this has something to do with it:
$ grep ldap config.log
configure:7155: checking ldap.h usability
conftest.c:72:18: ldap.h: No such file or directory
| #include <ldap.h>
configure:7199: checking ldap.h presence
conftest.c:38:18: ldap.h: No such file or directory
| #include <ldap.h>
configure:7270: checking for ldap.h
config.status:1086: creating dlls/wldap32/Makefile
ac_cv_header_ldap_h=no