Guix renamed gcc to gcc-toolchain

INSTALL.md

@@ -15,12 +15,12 @@
 After checking out the source from github with git submodules is is
 possibleto install the build tools with GNU Guix
 
-    guix package -i gcc gdb bash ld-wrapper ldc which python2 git
+    guix package -i gcc-toolchain gdb bash ld-wrapper ldc which python2 git
 
 Even better, with Guix, you can create a light-weight container in the source tree
 and run our development setup (gold was added lately by ldc)
 
-    guix environment -C guix --ad-hoc gcc gdb bash ld-wrapper ldc which python git binutils-gold
+    guix environment -C guix --ad-hoc gcc-toolchain gdb bash ld-wrapper ldc which python git binutils-gold vim
     make clean
     make -j 4
     make check