Compilation error in src/process.cpp when boost <= 1.44.0

[ghost]

I just tried to compile pion with boost 1.44.0. (I know it is an old version but this specific version is a requirement when building Adobe InDesign CS6 plugins.)
The error is introduced with the following commit:
9a3093d
where a line:
p.make_preferred();
was inserted.

As far as I have understood the boost code, make_preferred() is introduced with v3 of boost::filesystem.
So the line needs to be moved to after the following #if so it only takes effect when compiling with boost versions that use v.3 or higher. For boost version 1.44.0 and earlier which use v2 of boost::filesystem, this does not compile. In v.2 the return p.file_string() routine used in the #else part already does the conversion make_preferred() do in v3, so no changes for v.2 should be necessary.

So the fix should look like:

std::string process::generate_dumpfile_name()
{
...
     p /= ss.str();
     p.normalize();
-    p.make_preferred();

 # if defined(BOOST_FILESYSTEM_VERSION) && BOOST_FILESYSTEM_VERSION >= 3
+    p.make_preferred();
     return p.string();
#else
    return p.file_string();
#endif 

}