Cannot load library: libmpg123.so needed by "lib_SDL2_mixer.so

A couple of Galaxy Tab 2 users have emailed me to say running my Android SDL games gives the error:

Error: Cannot load library: soinfo_link_image(linker.cpp:1636): could not load library “libmpg123.so” needed by “libSDL2_mixer.so”; caused by load_library(linker.cpp:746): library “libmpg123.so” not found

Anyone know how to fix this?

Screenshot_2018-08-24-05-40-43