HashtableFixOSX

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This is a bug due to an outdated header in the Apple-supplied GCC compiler.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!