libpq.so.2.0 brings compilation problems

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name               :               Patrick LUCIEN
Your email address      :
stephane.dacremont@libertysurf.fr


System Configuration
---------------------
  Architecture (example: Intel Pentium)         : Intel
Pentium

        processor       : 450
        vendor_id       : Intel
        cpu family      : 6
        model           :
        model name      : Pentium 3
        stepping        :
        fdiv_bug        :
        hlt_bug         :
        sep_bug         :
        f00f_bug        :
        coma_bug        :
        fpu             :
        fpu_exception   :
        cpuid level     :
        wp              :
        flags           :
        bogomips        :

  Operating System (example: Linux 2.0.26 ELF)  :

        Linux Mandrake6.0 (based on RedHat6.0) 2.2.x

  PostgreSQL version (example: PostgreSQL-6.5.1):

      PostgreSQL-6.4.2

  Compiler used (example:  gcc 2.8.0)           :

        gcc (almost certainly a recent version)

  Libc version :

    ?

Please enter a FULL description of your problem:
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Compiling a C program using the libpq library fails.
I get the error:

/usr/lib/libpq.so:undefined symbol crypt

I use libpq.so.2.0 as furnished in a RPM package:
postgresql-6.4.2-devel...


Please describe a way to repeat the problem.   Please try to
provide a
concise reproducible example, if at all possible:
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any C program using libpq will do the job.

If you know how this problem might be fixed, list the solution
below:
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