Parallel algorithms in graph-tool


I'm trying to compile graph-tool with parallel algorithms enabled, but I
must be missing something from the instructions on:

Basically, the problem is where it says:
$ cd gcc-4.2.0
$ patch -E -p1 < ../gcc-shared-openmp.patch

I don't have a folder gcc-4.2.0 on my Ubuntu 64 bit system, although I have
gcc-4.2.0 installed. I've tried to save the patch to this directory instead:
$cd /usr/lib/gcc/x86_64-linux-gnu/4.2
But when I issue the command I get:
Patch: **** Only garbage was found in the patch input.

Any help would be much appreciated :slight_smile: