With musl and clang16 the following build error occurs:

client/run_run_svcs.c:24:17: error: use of undeclared identifier 'PATH_MAX'
   char pathbuf[PATH_MAX+1];
                ^
client/run_run_svcs.c:28:21: warning: if statement has empty body [-Wempty-body]
   D_PRINTF(abspath);
                    ^
client/run_run_svcs.c:28:21: note: put the semicolon on a separate line to silence this warning
client/connect_sock.c:28:4: error: call to undeclared library function 'memset' with type
      'void *(void *, int, unsigned long)'; ISO C99 and later do not support implicit function declarations
      [-Wimplicit-function-declaration]
   memset(&addr,0,socke);
   ^
client/connect_sock.c:28:4: note: include the header <string.h> or explicitly provide a declaration for
      'memset'
client/connect_sock.c:29:4: error: call to undeclared library function 'strcpy' with type
      'char *(char *, const char *)'; ISO C99 and later do not support implicit function declarations
      [-Wimplicit-function-declaration]
   strcpy(addr.sun_path, CINIT_SOCK);

This patch fixes all three of those errors
Bug: https://bugs.gentoo.org/898542
--- a/client/connect_sock.c
+++ b/client/connect_sock.c
@@ -8,6 +8,7 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "cinit.h"
 
--- a/client/run_run_svcs.c
+++ b/client/run_run_svcs.c
@@ -3,6 +3,7 @@
  * (c) 2005 Nico Schottelius (nico-linux at schottelius.org)
  * run services parallel
  */
+#include <linux/limits.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <dirent.h>