Undefined foreign symbol: "crypt"

Hi all, 
I code : 
(if (not (clsql:connected-databases))     
	(clsql:connect '("localhost" "menu-system" "postgres"
nil) :database-type :postgresql))
; something that used to be working, but now I get :

; Loading #P"/var/clfree/clsql-6.0.0/clsql-postgresql-socket.asd".
; Loading
#P"/var/clfree/clsql-6.0.0/db-postgresql-socket/postgresql-socket-package.x86f".
; Loading
#P"/var/clfree/clsql-6.0.0/db-postgresql-socket/postgresql-socket-api.x86f".

Undefined foreign symbol: "crypt"
   [Condition of type KERNEL:SIMPLE-PROGRAM-ERROR]

Restarts:
  0: [CONTINUE] Return NIL from load of
#P"/var/clfree/clsql-6.0.0/db-postgresql-socket/postgresql-socket-api.x86f".
  1: [RETRY   ] Retry performing #<ASDF:LOAD-OP (:VERBOSE NIL)
{590E1B4D}> on
                #<ASDF:CL-SOURCE-FILE
"postgresql-socket-api" {5876E14D}>.
  2: [ACCEPT  ] Continue, treating #<ASDF:LOAD-OP (:VERBOSE NIL)
{590E1B4D}> on
                #<ASDF:CL-SOURCE-FILE
"postgresql-socket-api" {5876E14D}> as
                having been successful.
  3: [ABORT   ] Return to Top-Level.

Debug  (type H for help)

(KERNEL:UNDEFINED-FOREIGN-SYMBOL-ERROR-HANDLER "<error finding name>"
                                               #.(SYSTEM:INT-SAP
#x3FFFC670)
                                               #<Alien (*

SYSTEM:SYSTEM-AREA-POINTER) at #x3FFFC37C>
                                               (16))
Source: Error finding source: 
Error in function DEBUG::GET-FILE-TOP-LEVEL-FORM:  Source file no longer
exists:
  target:code/interr.lisp.

Any suggestions about what might go wrong ?

Thanks in advance, Wout Perquin

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