Port coin fails to build under snow leopard

[dustman@…]

Port coin fails to build under snow leopard. Here is output from port command:

--->  Building Coin
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_Coin/work/Coin-3.1.0" && /usr/bin/make -j4 all " returned error 2
Command output:       _cglglue_context_make_current in gl_cgl.o
  "_CGLSetOffScreen", referenced from:
      cglglue_context_create_software(cglglue_contextdata*)       in gl_cgl.o
  "_CGLGetVirtualScreen", referenced from:
      _cglglue_context_make_current in gl_cgl.o
  "_CGLDestroyContext", referenced from:
      cglglue_contextdata_cleanup(cglglue_contextdata*)       in gl_cgl.o
  "_CGLDestroyPixelFormat", referenced from:
      cglglue_contextdata_cleanup(cglglue_contextdata*)       in gl_cgl.o
  "_CGLErrorString", referenced from:
      _cglglue_context_release_pbuffer in gl_cgl.o
      _cglglue_context_bind_pbuffer in gl_cgl.o
      _cglglue_context_make_current in gl_cgl.o
      _cglglue_context_make_current in gl_cgl.o
      _cglglue_context_make_current in gl_cgl.o
      cglglue_context_create_software(cglglue_contextdata*)       in gl_cgl.o
      cglglue_context_create_software(cglglue_contextdata*)       in gl_cgl.o
      cglglue_context_create_pbuffer(cglglue_contextdata*)       in gl_cgl.o
      cglglue_context_create_pbuffer(cglglue_contextdata*)       in gl_cgl.o
      cglglue_context_create_pbuffer(cglglue_contextdata*)       in gl_cgl.o
  "_CGLCreateContext", referenced from:
      cglglue_context_create_software(cglglue_contextdata*)       in gl_cgl.o
      cglglue_context_create_pbuffer(cglglue_contextdata*)       in gl_cgl.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[4]: *** [libCoin.la] Error 1
make[3]: *** [all-recursive] Error 1
make[2]: *** [all] Error 2
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Error: Status 1 encountered during processing.