diff --git a/HACKING b/HACKING
index fb6d7e95..15d0d968 100644
--- a/HACKING
+++ b/HACKING
@@ -4,7 +4,8 @@
 * SETUP
     guix environment -l guix.scm     #64 bit + 32bit
 
-    CC=i686-unkown-linux-gnu-gcc ./configure
+    CC=i686-unknown-linux-gnu-gcc ./configure
+    CC=arm-unknown-linux-gnu-gcc ./configure
 or
     ./configure
 
diff --git a/PORTING b/PORTING
index 706ea13f..9c653147 100644
--- a/PORTING
+++ b/PORTING
@@ -20,16 +20,14 @@ to your config.scm and run guix system reconfigure.
 
 ** Setup environment
 
+For example (note: ARM is no longer a 'port', see HACKING)
    #+BEGIN_SRC bash
-   guix environment -s armhf-linux --pure --ad-hoc bash coreutils diffutils gawk gcc-toolchain grep guile help2man make nyacc pkg-config sed texinfo
-   PATH=~/src/mescc-tools-arm/bin:$PATH
+   guix environment -s armhf-linux --pure --ad-hoc bash coreutils diffutils findutils gawk gcc-toolchain@7 grep git guile@2.2 gzip help2man make mescc-tools nyacc openssh-sans-x pkg-config sed tar texinfo
    #+END_SRC
 
-(No git, graphviz on ARM yet).
-
 ** Try it
    #+BEGIN_SRC bash
-   ./configure --with-courage --with-system-libc
+   CC=gnu-triplet-gcc ./configure --with-courage --with-system-libc
    ./simple.sh
    #+END_SRC