configure can't find sasl_getprop (v. 2.0.13)

[Werner Reisberger]

I want to upgrade from 1.6.24 to 2.0.13 but configure isn't able to find
libsasl although I am using the library since many month with 1.6.24:

  checking for sasl_getprop in -lsasl... no

My sasl libraries are in 

  /usr/local/sasl/lib

and I called configure with --with-sasl=/usr/local/sasl

If I check libsasl.so.7.1.8 with nm I see the sasl_getprop symbol.

Any hints?

 Werner