Configure file seems to look only for libldapssl30.so.

Moreover compile fails :

ldap.c: In function `php_info_ldap':
ldap.c:170: syntax error before `LDAPVersion'
ldap.c:178: `ver' undeclared (first use in this function)
ldap.c:178: (Each undeclared identifier is reported only once
ldap.c:178: for each function

I've noticed that you've forgotten a ";" in ldap.c (line 161) :

PHP_MINFO_FUNCTION(ldap)
{
        char maxl[32];
#if HAVE_NSLDAP
        char tmp[32]
        LDAPVersion ver;
        double SDKVersion;
#endif