Error when compilating cyrus imap

[Ami Stage]

hi,

i m working on a project about the extension CONVERT of IMAP but when i try to 
compile the makefile of the directory imap, i ve this error:

/dev/cyrus-imapd/sieve/comparator.c:282: undefined reference to 
`pcreposix_regexec'
collect2: ld returned 1 exit status
make[1]: *** [sievec] Erreur 1


have you an idea ? (it's important...)

thank you
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