Alternative approach to installing development headers.

Author: lohedges

azure-pipelines-osx.yml

@@ -12,7 +12,16 @@ jobs:
   steps:
   - script: |
       # make sure development headers are installed
-      sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.15.pkg -target /
+      xcode-select --install
+      sleep 1
+	  osascript << EOD
+        tell application "System Events"
+          tell process "Install Command Line Developer Tools"
+          keystroke return
+          click button "Agree" of window "License Agreement"
+          end tell
+        end tell
+      EOD
       ./compile_sire.sh --install $HOME/sire.app
     displayName: 'Build Sire'
   - script: |