Update FAQ about different image tools

Three different image utility packages have been described for macOS
(MacPorts and Homebrew) and Red Hat Linux. I don't have any other linux
so I can't explain how to do those with certainty (except for copy/paste
somewhere which might or might not be correct).

faq.md

@@ -37,6 +37,10 @@
 - [3.12 - How do I find out how to send interrupt/EOF etc. for entries that require it?](#faq3_12)
 - [3.13 - Why does an IOCCC winner fail to compile or or fail run?](#faq3_13)
 - [3.14 - How do I compile and install tcpserver for entries that require it?](#faq3_14)
+- [3.15 - How do I compile and install netpbm for entries that require it?](#faq3_15)
+- [3.16 - How do I compile and install libjpeg-turbo for entries that require it?](#faq3_16)
+- [3.16 - How do I compile and install ImageMagick for entries that require it?](#faq3_17)
+
 
 ## Section  4 - [Changes made to IOCCC winners](#faq4)
 - [4.0  - Why are some winning author remarks incongruent with the winning IOCCC code?](#faq4_0)
@@ -87,7 +91,7 @@ and you may only submit your entries to the IOCCC when the IOCCC is **OPEN**.
 
 1. Read the latest IOCCC rules and review the IOCCC guidelines
 
-Please read any pay close attention to the [official IOCCC rules](/rules.html).
+    Please pay close attention to the [official IOCCC rules](/rules.html).
 
     You are also **highly encouraged** to review the
     [official IOCCC guidelines](/guidelines.html) as they contain important
@@ -95,9 +99,7 @@ suggestions, useful hints, and IOCCC humor.  :-)
 
 2. Register for the IOCCC
 
-```
     XXX - instructions TBD - XXX
-```
 
     Once you have been registered, you will receive an email message for how to
     prepare your entries for submission, and how to upload the compressed tarballs
@@ -1263,6 +1265,111 @@ That will install it to `/usr/local/bin`. Now you should be able to use the
 entry in question.
 
 
+### <a name="faq3_15"></a><a name="netpbm"></a>3.15 - How do I compile and install netpbm for entries that require it?
+
+This depends on your operating system for which we describe a couple below.
+
+#### Red Hat based linux
+
+Execute one of the following as root or via sudo:
+
+```sh
+dnf install netpbm-progs netpbm
+yum install netpbm-progs netpbm
+```
+
+#### macOS: MacPorts
+
+If you haven't already, install
+[MacPorts](https://www.macports.org/install.php). Then run:
+
+
+```sh
+sudo port install libnetpbm netpbm
+```
+
+
+#### macOS: Homebrew
+
+If you have not already done so, install [Homebrew](https://brew.sh).
+
+Then to install netpbm:
+
+```sh
+brew install netpbm
+```
+
+
+### <a name="faq3_16"></a><a name="libjpeg"></a>3.16 - How do I compile and install libjpeg-turbo for entries that require it?
+
+This depends on your operating system for which we describe a couple below.
+
+#### Red Hat based linux
+
+Execute one of the following as root or via sudo:
+
+```sh
+dnf install libjpeg-turbo-utils libjpeg-turbo-devel libjpeg-turbo
+yum install libjpeg-turbo-utils libjpeg-turbo-devel libjpeg-turbo
+```
+
+#### macOS: MacPorts
+
+If you haven't already, install
+[MacPorts](https://www.macports.org/install.php). Then run:
+
+
+```sh
+sudo port install libjpeg-turbo libjpeg-turbo-devel
+```
+
+
+#### macOS: Homebrew
+
+If you have not already done so, install [Homebrew](https://brew.sh).
+
+Then to install `libjpeg-turbo`:
+
+```sh
+brew install libjpeg-turbo
+```
+
+
+### <a name="faq3_17"></a><a name="imagemagick"></a>3.17 - How do I compile and install ImageMagick for entries that require it?
+
+This depends on your operating system for which we describe a couple below.
+
+#### Red Hat based linux
+
+Execute one of the following as root or via sudo:
+
+```sh
+dnf install ImageMagick 
+yum install ImageMagick 
+```
+
+#### macOS: MacPorts
+
+If you haven't already, install
+[MacPorts](https://www.macports.org/install.php). Then run:
+
+
+```sh
+sudo port install ImageMagick
+```
+
+
+#### macOS: Homebrew
+
+If you have not already done so, install [Homebrew](https://brew.sh).
+
+Then to install ImageMagick:
+
+```sh
+brew install ImageMagick
+```
+
+
 ## <a name="faq4"></a>Section 4: Changes made to IOCCC winners