In Prefix (AIX and others), shared libs and loadable modules often need to be built in a different way than on Linux - libtool usually knows best. It is already configure'd and used via emake, but not for the plugins built directly in the ebuild. In the mean time I'm going to p.use.force 'minimal' on AIX. BTW: Please consider doing 'tc-export CC AR' (and maybe CXX for bug#219371) before econf instead of overwriting them later at emake - and subsequently use ${CC} instead of $(tc-getCC).
Created attachment 183896 [details, diff] patch to use libtool in openldap-2.4.11-r1.ebuild Unfortunately can only test for successful emerge here, not if the plugins still work. Also didn't test with 'kerberos' use-flag, but '-minimal' only.
Fixed in 2.4.17-r1.