Compiling on OS X

I'm having some libtool issues (I think). I'm getting the following
error from make..

/bin/sh ../libtool --mode=link gcc  -g -O2 -Wall -W -Wshadow -pedantic   -o 
mod_cgi.la -rpath /usr/local/lib -module -export-dynamic -avoid-version 
-no-undefined cgi.lo  
gcc  -o .libs/mod_cgi.so -bundle  .libs/cgi.o 
ld: Undefined symbols:
_array_free
_array_get_unused_element
[..]

I'm not sure how OS X normally does things like this.. It looks like
something has added underscores in front of the symbol names..

Thanks in advance for any help.