diff --git a/README.md b/README.md
index bacf1669..47d64d95 100644
--- a/README.md
+++ b/README.md
@@ -166,28 +166,39 @@ deploy:
 1. Install arduino-cli from here: https://arduino.github.io/arduino-cli/installation/
 2. Download ci-arduino
    * `git clone https://github.com/adafruit/ci-arduino`
-3. Put these lines at the end of your `.bashrc` or `.bash_profile` if you're on OSX. Make sure to fill in the path to where you installed ci-arduino and replacing USER with your username.
+3. Put these lines at the end of your `.bashrc` or `.bash_profile` if you're on OSX. Make sure to fill in the path to where you installed ci-arduino. Make sure to that the libraries directory exists by installing a library first:
+   * `arduino-cli lib install "Adafruit NeoPixel"` 
+   * Linux
    ```bash
    alias test-platforms='python3 ~/path/to/ci-arduino/build_platform.py'
-   export HOME=/home/USER/
+   export HOME_DIR=/home/$USER
    ```
+   * Mac/OSX
+   ```bash
+   alias test-platforms='python3 ~/path/to/ci-arduino/build_platform.py'
+   export HOME_DIR=/Users/$USER
+   export ARDUINO_LIB_DIR=/Documents/Arduino/libraries
+   ```
+   * Then run `source ~/.bashrc` (Linux) or `source ~/.bash_profile` (Mac/OSX)
+   * If this file doesn't already exist, you can create it with `source ~/.bashrc` (Linux) or `source ~/.bash_profile` (Mac/OSX)
 4. Run this at the top level of the library you want to test
    ```bash
    adafruit@adafruit:~/Adafruit_BMP183_Library$ export GITHUB_WORKSPACE=$(pwd)
    ```
 5. Remove everything in test library, and re-create it
    ```bash
-   adafruit@adafruit:~/Adafruit_BMP183_Library$ rm -rf ~/Arduino/libraries/Adafruit_Test_Library/; mkdir ~/Arduino/libraries/Adafruit_Test_Library
+   adafruit@adafruit:~/Adafruit_BMP183_Library$ rm -rf $HOME_DIR$ARDUINO_LIB_DIR/Adafruit_Test_Library/; mkdir $HOME_DIR$ARDUINO_LIB_DIR/Adafruit_Test_Library
    ```
 6. Still in the top-level directory of the library you'll be testing, copy the current library to Adafruit_Test_Library
    ```bash
-   adafruit@adafruit:~/Adafruit_BMP183_Library$ cp * ~/Arduino/libraries/Adafruit_Test_Library/
+   adafruit@adafruit:~/Adafruit_BMP183_Library$ cp * $HOME_DIR$ARDUINO_LIB_DIR/Adafruit_Test_Library/
    ```
 7. Grep for build_platform.py in githubci.yml to find out what boards to test.
    ```bash
    adafruit@adafruit:~/Adafruit_BMP183_Library$ grep 'build_platform.py' .github/workflows/githubci.yml
            run: python3 ci/build_platform.py main_platforms
    ```
+   * If nothing useful is returned, open .github/workflows/githubci.yml and find the list where the platforms to test are
 8. Run test-platforms. This may take a while, and tests for some boards sometimes run orders of magnitude slower than tests for other boards.
    ```bash
    test-platforms main_platforms
diff --git a/build_platform.py b/build_platform.py
index 1952dde7..a6c96229 100644
--- a/build_platform.py
+++ b/build_platform.py
@@ -26,6 +26,17 @@
         BUILD_DIR = os.path.abspath(".")
         pass
 
+# Get home directory
+try:
+    HOME = os.environ["HOME_DIR"]
+except KeyError:
+    HOME = os.environ["HOME"]
+
+try:
+    ARDUINO_LOCATION = os.environ["ARDUINO_LIB_DIR"]
+except KeyError:
+    ARDUINO_LOCATION = '/Arduino/libraries'
+
 os.environ["PATH"] += os.pathsep + BUILD_DIR + "/bin"
 print("build dir:", BUILD_DIR)
 
@@ -179,7 +190,7 @@ def run_or_die(cmd, error):
 # link test library folder to the arduino libraries folder
 if not IS_LEARNING_SYS:
     try:
-        os.symlink(BUILD_DIR, os.environ['HOME']+'/Arduino/libraries/Adafruit_Test_Library')
+        os.symlink(BUILD_DIR, HOME+ARDUINO_LOCATION+'/Adafruit_Test_Library')
     except FileExistsError:
         pass
 
@@ -209,7 +220,7 @@ def run_or_die(cmd, error):
 if our_name:
     run_or_die("arduino-cli lib uninstall \""+our_name+"\"", "Could not uninstall")
 
-print("Libraries installed: ", glob.glob(os.environ['HOME']+'/Arduino/libraries/*'))
+print("Libraries installed: ", glob.glob(HOME+ARDUINO_LOCATION+'/*'))
 
 ################################ Test platforms
 platforms = []