Update configure script to check for swig >= 3 (#1554)

docs/developer_docs/Configure.md

@@ -0,0 +1,30 @@
+| [Home](/trick) → [Developer Docs](Developer-Docs-Home) → Configure |
+|------------------------------------------------------------------|
+
+
+# Updating the configure script
+
+Trick uses `autoconf` to find and version check dependencies. The autoconf scripts live in the `autoconf/` directory, and the generated script that the user runs is `configure` in the Trick home directory.
+
+
+## How to update the configure script
+
+The configure script run by the user is generated by autoconf. To update it - 
+
+1. Make changes in the `autoconf/` directory, likely to `configure.ac` and macros in the `m4/` directory
+1. From the `autoconf/` directory, run:
+```
+aclocal
+autoconf -o ../configure
+```
+
+
+### Notes
+
+If you get an error message that looks like 
+
+```
+possibly undefined macro: AC_MSG_ERROR
+```
+
+Install the package `autoconf-archive`.

docs/developer_docs/Developer-Docs-Home.md

@@ -11,6 +11,7 @@ Link documentation for Trick internals, processes, and plans here.
 - [Tooling and Sanitizers](Tooling-and-Sanitizers)
 - [Python Environment](Python-Environment-Issues)
 - [CI](CI)
+- [Configure Script](Configure)
 
 Old design documentation - may or may not be up to date