Changing PATH and downloading mpich-default

[Evan Phillips]

After installing the Macports package, I appended /opt/local/bin:/opt/local/sbin:/ to the PATH variable using the EXPORT command. Probably a mistake:
PATH=/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

How might I reset or change this? I realized this when I was trying to download mpich-default:

sudo port -v install mpich-default
--->  Computing dependencies for mpich-default....................
--->  Dependencies to be installed: gcc49 cctools llvm-3.5 cloog gmp isl gcc_select ld64 ld64-latest libgcc libiconv libmpc mpfr libxml2 xz gettext expat mpi-doc mpi_select
--->  Extracting llvm-3.5
Error: org.macports.extract for port llvm-3.5 returned: Failed to locate 'xz' in path: '/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin' or at its MacPorts configuration time location, did you move it?
Warning: targets not executed for llvm-3.5: org.macports.activate org.macports.extract org.macports.patch org.macports.configure org.macports.build org.macports.destroot org.macports.install
Error: Failed to install llvm-3.5
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