diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5fa761aa..426114bc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1786,7 +1786,7 @@ packages:
         - type-spec
         - pretty-types
         - mediabus
-        #- mediabus-fdk-aac # needs non-free libfdk-aac-dev
+        - mediabus-fdk-aac
         - mediabus-rtp
 
     # "Will Thompson <will@willthompson.co.uk> @wjt":
diff --git a/debian-bootstrap.sh b/debian-bootstrap.sh
index 59bc9abc..5d9eebf0 100755
--- a/debian-bootstrap.sh
+++ b/debian-bootstrap.sh
@@ -181,3 +181,8 @@ wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - \
     && add-apt-repository "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-4.0 main" \
     && apt-get update \
     && apt-get install -y llvm-4.0
+
+# non-free repo
+apt-add-repository multiverse
+    && apt-get update
+    && apt-get install -y libfdk-aac-dev