png2html port linker error [help?]

[Kris Yates]

png2html-1.1_1                      <   needs updating (port has 1.1_3)  
linker error

While exec "portupgrade png2html-1.1_1":
 

"/usr/libexec/elf/ld: cannot find -lgd

*** Error code 1

Stop in /usr/ports/graphics/png2html/work/png2html-1.1.

*** Error code 1

Stop in /usr/ports/graphics/png2html.

** Command failed [exit code 1]: /usr/bin/script -qa 
/tmp/portupgrade20476.0 make

** Fix the problem and try again.

** The following packages were not installed or upgraded (*:skipped / 
!:failed)

       ! graphics/png2html (png2html-1.1_1)    (linker error)"


What do I do?  Please send reply to me as I cannot check the list very 
often.

Thanks,

Kris