it wrongly assumes that any system out there has the same internals as glibc.
if it uses those internals at all, it should at least check if they are available and if not choose an alternate implementation that doesn't rely on those internals (even it if its just a "sorry, this function is not available" implementation).

tested against musl libc 0.7.2

linux-thread-db.Tpo linux-thread-db.c
linux-thread-db.c: In function `dladdr_to_soname':
linux-thread-db.c:618: error: `Dl_info' undeclared (first use in this function)
linux-thread-db.c:618: error: (Each undeclared identifier is reported only once
linux-thread-db.c:618: error: for each function it appears in.)
linux-thread-db.c:618: error: syntax error before "info"
linux-thread-db.c:620: warning: implicit declaration of function `dladdr'
linux-thread-db.c:620: error: `info' undeclared (first use in this function)
linux-thread-db.c: In function `try_thread_db_load_1':
linux-thread-db.c:717: error: `LIBTHREAD_DB_SO' undeclared (first use in this function)
linux-thread-db.c: In function `thread_db_load_search':
linux-thread-db.c:803: error: `LIBTHREAD_DB_SO' undeclared (first use in this function)
linux-thread-db.c: In function `thread_db_load':
linux-thread-db.c:890: error: `LIBTHREAD_DB_SO' undeclared (first use in this function)
linux-thread-db.c: In function `thread_db_pid_to_str':
linux-thread-db.c:1488: warning: long unsigned int format, thread_t arg (arg 4)
linux-thread-db.c: In function `thread_db_find_thread_from_tid':
linux-thread-db.c:1597: warning: comparison between pointer and integer
linux-thread-db.c: In function `_initialize_thread_db':
linux-thread-db.c:1676: error: `LIBTHREAD_DB_SEARCH_PATH' undeclared (first use in this function)