message: add hint to the toolchain scripts
diff: # HermitCore - A lightweight unikernel for a scalable and predictable runtime behavior
  -[![Build Status](https://travis-ci.org/RWTH-OS/HermitCore.svg?branch=master)](https://travis-ci.org/RWTH-OS/HermitCore)
  +[![Build Status](https://travis-ci.org/RWTH-OS/HermitCore.svg?branch=devel)](https://travis-ci.org/RWTH-OS/HermitCore)
  The project [HermitCore]( http://www.hermitcore.org ) is a new
  [unikernel](http://unikernel.org) targeting a scalable and predictable runtime
  @@ -31,12 +31,11 @@ production ready. Please use it with caution.
  The build process works currently only on **x86-based Linux** systems. To build
  the HermitCore kernel and applications you need:
  - * CMake
  + * CMake, GNU Make, GNU Binutils
  * Netwide Assember (NASM)
  * recent host compiler such as GCC
  * HermitCore cross-toolchain, i.e. Binutils, GCC, newlib, pthreads-embedded
  -
  ### HermitCore cross-toolchain
  We provide prebuilt packages (currently Debian-based only) of the HermitCore
  @@ -48,13 +47,7 @@ $ sudo apt-get -qq update
  $ sudo apt-get install binutils-hermit newlib-hermit pthread-embedded-hermit gcc-hermit libhermit
  ```
  -If you want to build the toolchain yourself, have a look at the following
  -repositories, especially at `debian/rules` in each repository:
  -
  - * [GCC](https://github.com/RWTH-OS/gcc)
  - * [Binutils](https://github.com/RWTH-OS/binutils)
  - * [Newlib](https://github.com/RWTH-OS/newlib)
  - * [Pthread-embedded](https://github.com/RWTH-OS/pthread-embedded)
  +If you want to build the toolchain yourself, have a look at the repository [hermit-toolchain](https://github.com/RWTH-OS/hermit-toolchain), which contains scripts to build the whole toolchain.
  Depending on how you want to use HermitCore, you might need additional packages
  such as:
  