On Hurd and kfreebsd under Debian, I have disabled the build of the parser

since things go extremely badly when capabilities disappear. If someone
wants to work on it, I have some initial patch attempts, but it was getting
too time-consuming, so I back-burnered the parser. A very small change was
needed to get the libraries to build, and this is it.

Description: Workaround non-Linux environments to build everything but the
 parser.
Author: Kees Cook <kees@debian.org>
Acked-By: Steve Beattie <sbeattie@ubuntu.com>

libraries/libapparmor/src/kernel_interface.c

@@ -37,7 +37,11 @@ static int setprocattr(const char *path, const char *buf, int len)
 	int rc = -1;
 	int fd, ret, ctlerr = 0;
 	char *ctl = NULL;
+#ifdef SYS_gettid
 	pid_t tid = syscall(SYS_gettid);
+#else
+	pid_t tid = getpid();
+#endif
 
 	if (!buf) {
 		errno = EINVAL;