[qsheff] Error on installing qsheff-II-2.1

[x_patriot paracetamol]

Dear all,
im having trouble installing (actually upgrading my qsheff r1 to qsheff-II-2.1) on my freeBSD box, below is the result :
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bash# uname -a
FreeBSD xx.bob.co.id 4.3-RELEASE FreeBSD 4.3-RELEASE #0: Fri Oct 14 22:38:31 JAVT 2005

bash# ./configure (im using default)
all process were sucessful...

bash# make
scanengine.o(.text+0x90d): undefined reference to `strcasestr'
make[2]: *** [qsheff] Error 1
make[2]: Leaving directory `/source/qsheff/r2/qsheff-II-2.1-r2/src'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/source/qsheff/r2/qsheff-II-2.1-r2/src'
make: *** [all-recursive] Error 1

error messages appears...seem like my systems doesn't support 'strcasestr'..

any help to solve this..? i need this software running immediatly..

sorry for my bad english,

Regards,

Chole