Postgres problem

Hello:

I am having problem interfacing the postgres database with the
frontend(libpq),i.e using C.Database runs fine.

PROBLEMS ARE:
1)When compiling the C-program given in the
example for connecting the database to the
frontend using
$gcc -I /home/guest/pgsql/include test.c

output:
/tmp/ccwWFbHo.o:In function 'exit_nicely':
/tmp/ccwWFbHo.o(.text+0x8):undefined referance to 'PQfinish'

/tmp/ccwWFbHo.o:In function 'main':
/tmp/ccwWFbHo.o(.text+0x66):undefined referance to
'PQsetdblogin'

/tmp/ccwWFbHo.o(.text+0x66):undefined referance to 'PQstatus'

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2)When I want to use the command
$createlang c (dbname)
OUTPUT:
createlang:missing required argument PGLIB directory.

...............................................................

I shall be grateful if you reply giving me suggestion to solve
the problems.

Thanking you

With regards

Simanchal

c/o Prof L M Patnaik