doc: tell minimum Android NDK this has been tested with

With ndk21r, `LD` should be set to `ld.lld`.

diff --git a/README.md b/README.md
index 8d856e31ec0f8d23f524df94e33bda09daafb6ac..05698684ea4eea437b29fd202b687845d5cd3452 100644 (file)
--- a/README.md
+++ b/README.md
@@ -114,8 +114,9 @@ user/group `_lldpd`. Have a look at how this is done in
 Installation (Android)
 ----------------------
 
-You need to download [Android NDK][]. Once unpacked, go inside the
-unpacked directory and select a toolchain, a target, and an API level:
+You need to download [Android NDK][] (version 22 or later). Once
+unpacked, go inside the unpacked directory and select a toolchain, a
+target, and an API level:
 
     export TOOLCHAIN=$PWD/toolchains/llvm/prebuilt/linux-x86_64
     export TARGET=aarch64-linux-android