cmake HAVE_IPV6 examples

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/deplibs/mpg123/ports/cmake/src/CMakeLists.txt :46 

check_function_exists(getaddrinfo HAVE_IPV6)

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/deplibs/mpg123/ports/cmake/src/CMakeLists.txt :318 

cmake_dependent_option(IPV6 "IPv6 support (actually any protocol your libc does with getaddrinfo)" ON "HAVE_IPV6" OFF)