While trying to install openssl-1.0.0n and httpd-2.2.29, configure was giving an error like this:
checking for SSL_set_cert_store… no
configure: error: … Error, SSL/TLS libraries were missing or unusable
make: *** No targets specified and no makefile found. Stop.
make: *** No rule to make target `install’. Stop.
Thanks to this page I was able to work it out, by prepending ‘export LDFLAGS=-ldl’ to the configure command.
This page also has some good discussion and possible answers.