Merge commit 'e988fee1679536137b87d10e939eff5c1f27c8ab' as 'libs/libzmq'

libs/libzmq/builds/android/README.md

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+# Android Build
+
+## Prerequisites
+
+You need the Android Native Development Kit (NDK) installed. See
+[here](https://developer.android.com/ndk) to download it.
+
+This project is tested against Android NDK version r25.
+
+If you installed version r25 all you have to do is to expose the NDK root
+directory as environment variable, e.g:
+
+    export ANDROID_NDK_ROOT=$HOME/android-ndk-r25
+
+If you installed another version you have to expose the NDK root directory as
+well as the NDK version, e.g:
+
+    export ANDROID_NDK_ROOT=$HOME/android-ndk-r17c
+    export NDK_VERSION=android-ndk-r17c
+
+To specify the minimum sdk version set the environment variable below:
+
+    export MIN_SDK_VERSION=21   # Default value if unset
+
+To specify the prefix directory set the environment variable below:
+
+    export ANDROID_BUILD_DIR=./builds/android/prefix/<android_arch> # Default value if unset
+
+## Build
+
+In the android directory, run:
+
+    ./build.sh [ arm | arm64 | x86 | x86_64 ]