Update the build instructions to match reality.
Change-Id: I803818784cf244c560dcb77f9753955d6fadb1c1
diff --git a/GettingStarted.md b/GettingStarted.md
index 94f8ebd..7d5a8d3 100644
--- a/GettingStarted.md
+++ b/GettingStarted.md
@@ -100,7 +100,15 @@
## Build the tree
-To build the tree, first you need to prepare your environment:
+To build the tree, first you need to prepare your environment by installing some
+basic packages on your host. You can install them by doing the following:
+
+```
+apt-get install build-essential qemu-user-static bc
+```
+
+Once that's done (you should only ever need to do this once) you can setup your
+environment by running this:
```
source build/setup.sh
@@ -111,22 +119,6 @@
information, or simply [read the source
here](https://aiyprojects.googlesource.com/build/+/refs/heads/master/setup.sh).
-Currently the build system is configured to make use of Google's internal
-continuous build system to speed up the build. Unfortunately, these tools are
-not available publicly. This will likely change in the future, but for now,
-you'll want to disable the use of this functionality by setting the following
-environment variables:
-
-```
-export IS_EXTERNAL=true
-```
-
-The next step is to install the prerequisite packages by running:
-
-```
-m prereqs
-```
-
Now you can build the tree by running:
```
@@ -136,13 +128,15 @@
The first time you'll be asked to set a pbuilder mirror site. Use
http://deb.debian.org/debian.
-If you have not modified any packages, and would like to speed your install:
+If you have not modified any packages, and would like to speed up your build,
+specify `FETCH_PACKAGES=true` like this:
```
FETCH_PACKAGES=true m
```
-This will cause packages to be fetched from Aptitude.
+This will cause packages to be fetched from the upstream Mendel APT repositories
+instead of building them locally.
## Artifact caching
