update installation for Haskell

diff --git a/how_to_get_the_programming_languages_running_on_your_computer.mdwn b/how_to_get_the_programming_languages_running_on_your_computer.mdwn
index 654859f..b03f816 100644 (file)
--- a/how_to_get_the_programming_languages_running_on_your_computer.mdwn
+++ b/how_to_get_the_programming_languages_running_on_your_computer.mdwn
@@ -391,9 +391,15 @@ That was to update my `PATH` variable as instructed by Cabal. On a Linux machine
 
 Some instructions may say to use `.bashrc` instead of `.bash_profile`. These files do similar jobs.
 
 
 Some instructions may say to use `.bashrc` instead of `.bash_profile`. These files do similar jobs.
 

-After issuing the relevant `echo` command, I exited the Terminal and started a new Terminal session. Now if I type `echo $PATH` I should see the directory I just added in the list. Now I can contine setting up Cabal. I next type:
+After issuing the relevant `echo` command, I exited the Terminal and started a new Terminal session. Now if I type `echo $PATH` I should see the directory I just added in the list. Now I can contine setting up Cabal. I type:
+
+    which alex happy
+
+If that gives me back two pathnames, one to the program `alex` and the other to the program `happy`, then I'm already finished. If not, then I type:

 
     cabal install alex happy
 
 
     cabal install alex happy
 

-This installs some helper programs that Cabal needs to build and install some packages.
+This installs those two programs. They are helpers that Cabal needs to build and install some packages.
+
+<!-- https://github.com/pittsburgh-haskell/haskell-installation -->