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 Compilation in a separate directory   

If you wish to build the object files and executables in a directory other than the one containing the source files, use the following.

1.
Make sure you have a version of Make that supports the VPATH feature. (GNU Make supports it, as do Make versions on most BSD systems.)

2.
If you have ever run ‘configure’ in the source directory, you must undo the configuration. Do this by running make distclean.

3.
Go to the directory in which you want to build the compiler before running ‘configure’:

On systems that do not support symbolic links, this directory must be on the same file system as the source code directory.

4.
Specify where to find configure when you run it:

This also tells configure where to find the compiler sources; configure takes the directory from the filename that was used to invoke it. But if you want to be sure, you can specify the source directory with the ‘—srcdir’ option, like the following example demonstrates. The directory you specify with ‘--srcdir’ need not be the same as the one in which configure is found.

Now, you can run make in that directory. You need not repeat the configuration steps shown previously when ordinary source files change. You must, however, run configure again when the configuration files change, if your system does not support symbolic links. 

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