[GRASSLIST:1860] error with d.m in grass57

[hamdi ines]

hello,
i want to use the graphic for grass 5.7, I used the
d.m command but the result is:
>Error in startup script: ps.map: error while loading
shared libraries: libpq.so.3: cannot open shared
object file: No such file or directory
    while executing
>"exec ps.map -p"
    (procedure "DmPrint::init" line 14)
    invoked from within
>"DmPrint::init"
    (procedure "main" line 27)
    invoked from within
>"main"
    (file "/home/softgrass/binnb/etc/dm/d.m.tcl" line
765)
please can you help to resolv the problem.
thank you.

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