OS X 'make' error

[Sean <endersyrinx gmail com>]

Hi,

I'm trying to install gtk+ 2.20.1 on OS X 10.6.3. I receive the
following errors when running make:

dyld: lazy symbol binding failed: Symbol not found: _iconv_open
  Referenced from: /Users/sean/opt/gtk/lib/libglib-2.0.0.dylib
  Expected in: flat namespace

dyld: Symbol not found: _iconv_open
  Referenced from: /Users/sean/opt/gtk/lib/libglib-2.0.0.dylib
  Expected in: flat namespace

/bin/sh: line 1: 42660 Trace/BPT trap
GDK_PIXBUF_MODULE_FILE=../gdk-pixbuf/gdk-pixbuf.loaders
./gtk-update-icon-cache --force --ignore-theme-index --source
builtin_icons stock-icons > gtkbuiltincache.h.tmp
make[2]: *** [gtkbuiltincache.h] Error 133
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

A Google search mentioned that _iconv_open is something to do with the
libiconv package, which is installed.

Thanks for your help.