[ci] add flac to azure

diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 4b74c62..8c45005 100644 (file)
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -29,7 +29,7 @@ jobs:
   - script: |
       brew update
       brew install pkg-config gnupg
-      brew install sox ffmpeg libsndfile libvorbis lcov
+      brew install sox ffmpeg libsndfile libvorbis flac lcov
     displayName: 'brew install'
   - script: |
       make