cairo-1.8.8 not building under MacPorts 1.8.1, Snow Leopard 10.6.1

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Trying to install R. Requires cairo, which fails as follows:

lydia:local pbw$ sudo port clean cairo ---> Cleaning cairo lydia:local pbw$ sudo port install cairo ---> Computing dependencies for cairo ---> Fetching cairo ---> Verifying checksum(s) for cairo ---> Extracting cairo ---> Configuring cairo ---> Building cairo Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_graphics_cairo/work/cairo-1.8.8" && /usr/bin/make -j2 all " returned error 2 Command output: "_png_get_error_ptr", referenced from:

_png_simple_warning_callback in cairo-png.o _png_simple_error_callback in cairo-png.o _stream_read_func in cairo-png.o _stream_write_func in cairo-png.o _stdio_read_func in cairo-png.o _stdio_write_func in cairo-png.o

"_png_create_write_struct", referenced from:

_write_png in cairo-png.o

"_png_destroy_read_struct", referenced from:

_read_png in cairo-png.o

"_png_create_info_struct", referenced from:

_read_png in cairo-png.o _write_png in cairo-png.o

"_png_get_io_ptr", referenced from:

_stream_read_func in cairo-png.o _stream_write_func in cairo-png.o _stdio_read_func in cairo-png.o _stdio_write_func in cairo-png.o

"_png_set_read_user_transform_fn", referenced from:

_read_png in cairo-png.o _read_png in cairo-png.o

"_png_read_image", referenced from:

_read_png in cairo-png.o

ld: symbol(s) not found collect2: ld returned 1 exit status make[3]: * [libcairo.la] Error 1 make[2]: * [all] Error 2 make[1]: * [all-recursive] Error 1 make: * [all] Error 2