- Removed old, deprecated TODO on libunwind section.

- Added zsh dependency
- Fixed subtle typo in LLVM + clang section

docs/INSTALLING.md

@@ -39,7 +39,7 @@ sudo apt-get install libncurses5-dev zlib1g-dev
 
 ### LLVM + clang
 
-LLVM and clang depend on a pretty modern compiler; the steps below assume you uinstalled GCC 4.8.2 as described above.  It should be possible to build using clang >= 3.1, such as what you might find on a Mac, but that will require changes to the way LLVM is configured (specified in src/Makefile) that I haven't tested.
+LLVM and clang depend on a pretty modern compiler; the steps below assume you installed GCC 4.8.2 as described above.  It should be possible to build using clang >= 3.1, such as what you might find on a Mac, but that will require changes to the way LLVM is configured (specified in src/Makefile) that I haven't tested.
 
 ```
 cd ~/pyston_deps
@@ -67,8 +67,6 @@ make -j4
 make install
 ```
 
-TODO would be nice to install this locally like the rest of the dependencies
-
 ### valgrind
 
 valgrind is close to being an optional dependency, but since Pyston contains a custom memory allocator, it has some basic (and mostly-broken) valgrind hooks to let it know what memory is safe to access or not.  TODO it'd be nice to be able to turn that off with a Makefile flag since it's not useful for most people.
@@ -92,6 +90,12 @@ Then, add this line to your Makefile.local:
 VALGRIND := VALGRIND_LIB=$(HOME)/pyston_deps/valgrind-3.9.0-install/lib/valgrind $(HOME)/pyston_deps/valgrind-3.9.0-install/bin/valgrind
 ```
 
+### zsh
+`zsh` is needed when running pyston tests.
+```
+apt-get install zsh
+```
+
 # Optional dependencies
 
 ### distcc