Reverting to continue using GNU.

README

@@ -1,17 +1,17 @@
 ===============
 *** Colonel ***
 ===============
-Colonel (pronounced as it is spelt) is a small hobby kernel project
-that I'm working on. It currently supports the following architectures:
-
+This is a small OS project I'm working on. It's slow progress and
+probably shouldn't be run anywhere except in an emulator. It currently
+supports the following architectures:
  - x86
 
 # Compiling
 -----------
-This project uses Clang (https://clang.llvm.org/) and NASM
-(http://www.nasm.us/) for building. You will also require GNU Make
-(https://www.gnu.org/software/make/), unless you want to manually go
-through and compile the files.
+You'll want to setup a cross-compilation toolchain with GCC
+(https://gcc.gnu.org/) for your target architecture, along with
+GNU Make (https://www.gnu.org/software/make/) (I'll switch to the
+GNU autotools as soon as I can get them to work properly).
 
 To compile a full image you can run `make build-iso`, which will use
 GNU GRUB (https://www.gnu.org/software/grub/) as the bootloader. Else,