ignoring nonexistent directory "/usr/local/include"
 ignoring nonexistent directory "/usr/lib/gcc/x86_64-alpine-linux-musl/6.2.1/../../../../x86_64-alpine-linux-musl/include"
 ignoring nonexistent directory "/usr/include/fortify"

#include "..." search starts here:
#include <...> search starts here:
 /usr/include
 /usr/lib/gcc/x86_64-alpine-linux-musl/6.2.1/include