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Most probably you are here because you encountered this error on configure:

error: You have a broken version of the <tr1/unordered_set> header...

This is a bug due to an outdated header in the Apple-supplied GCC compiler. Here is how to fix it.

  1. Download SVN revision 104939 of tr1/hashtable from the gcc-4_0-branch SVN repository
  2. Replace Apple's version with the downloaded file from SVN revision 104939 and restore file permissions and ownership:
  • Replace file (assuming the new file is located in ~/Downloads):
$ sudo mv /usr/include/c++/4.0.0/tr1/hashtable /usr/include/c++/4.0.0/tr1/hashtable-orig

$ sudo cp ~/Downloads/hashtable /usr/include/c++/4.0.0/tr1

  • Check new file:
$ ls -l /usr/include/c++/4.0.0/tr1/hashtable
  • Change permissions/ownership if needed:
$ sudo chmod 644 /usr/include/c++/4.0.0/tr1/hashtable
$ sudo chown root:wheel /usr/include/c++/4.0.0/tr1/hashtable

Now it should be fixed!