as per $URL, support for bdb version 6.0.20 and higher is dropped due to licensing concerns. it is probably advisable that this slot is blocked to avoid people converting their database on 2.3.39 to a version which is incompatible later (that being 2.4.40+). http://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=blobdiff;f=build/openldap.m4;h=5d27cc3525375451264e4c48b526057a74e7a903;hp=98b038183defa9ee5585fe0e346aa7ea30708387;hb=f66d2a1c7ef1b4bb4f1da8ab701b322500b8e123;hpb=0e357d6de0218ed7c1e0daa9bf872f37b2ce5181 Reproducible: Always
In 2.4.40 already per upstream