How to add a custom MACRO when using NDK?

If you would like to add a special definition when compiling your NDK code (jni) add the following into your Android.mk:

LOCAL_CFLAGS    := -DMYDEFINE

This will define the Macro MYDEFINE in your c/c++ code. Here an example

#ifdef MYDEFINE
// We build the project with this special macro
#else
// We build without setting the macro in the LOCAL_CFLAGS
#endif