problem installing firefox

[trypticon at SAFe-mail.net]

I'm having trouble installing firefox on freebsd-4.10. When i try to install it it gives me this error: 

/usr/libexec/elf/ld: cannot find -lXcursor
gmake[2]: *** [libgtkxtbin.so] Error 1
gmake[2]: Leaving Directory '/usr/ports/www/firefox/work/mozilla
/widget/src/gtkxtbin'
gmake[1]: *** [tier_9] Error 2
gmake[1]: Leaving Directory`/usr/ports/www/firefox/work/mozilla'
gmake: *** [default] Error 2
*** Error code 2

any help would be appreciated.