Apologies if this has already been reported, but... It turns out that the HDF5 build will fail when *upgrading* from 1.6.5_0 to 1.6.6_0 with the following error: gcc .libs/getnameS.o -O2 -std=c99 -Wno-long-long -O -fomit-frame- pointer -finline-functions -o .libs/getname getname.o -L./.libs - lh5test -L/opt/local/lib -L/opt/local/lib/lib -L../src/.libs -lhdf5 - lz -lm /usr/bin/ld: warning -L: directory name (/opt/local/lib/lib) does not exist /usr/bin/ld: Undefined symbols: _H5G_user_path_test collect2: ld returned 1 exit status make[2]: *** [getname] Error 1 make[1]: *** [tests] Error 1 make: *** [all] Error 2 This is because it finds the old libhdf5.a in /opt/local/lib before finding it in ../src/.libs (the local build directory). I was able to work around this problem by: port uninstall -f hdf5 port install hdf5 It would be nice to somehow patch or fix the software so that this doesn't bite other unwitting upgraders... thanks! chris