diff --git a/More-Installation-Guides.md b/More-Installation-Guides.md
index 21a920f..affc4d2 100644
--- a/More-Installation-Guides.md
+++ b/More-Installation-Guides.md
@@ -5,8 +5,8 @@ Here are [contributed instructions](https://github.com/koalaman/shellcheck/issue
 ```bash
 # Haskell Deps. Or read on and use that source in the wiki.
 yum groupinstall "Development Tools" -y
-yum install gmp-devel # may need epel
-sudo ln -s libgmp.so.3 /usr/lib64/libgmp.so.10
+yum install gmp-devel zlib # may need epel; zlib as shellcheck builddep reported in #519
+sudo ln -s libgmp.so.3 /usr/lib64/libgmp.so.10 # HACK
 
 # Get haskell. https://www.haskell.org/platform/linux.html#linux-generic
 # Or follow https://wiki.haskell.org/GNU/Linux#RHEL.2C_CentOS.2C_Scientific_Linux_5_and_6_and_Fedora_16_and_17.