musl/clang:

fh_key_file.c:45:67: error: call to undeclared library function 'strerror' with type 'char *(int)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   45 |                 xlog(L_ERROR, "Unable to read fh-key-file %s: %s", fh_key_file, strerror(errno));
      |                                                                                 ^
fh_key_file.c:45:67: note: include the header <string.h> or explicitly provide a declaration for 'strerror'

--- nfs-utils-2.9.1/support/nfs/fh_key_file.c.vanilla	2026-05-14 15:08:37.910086418 +0200
+++ nfs-utils-2.9.1/support/nfs/fh_key_file.c	2026-05-14 15:08:49.161017995 +0200
@@ -26,6 +26,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 #include <errno.h>
+#include <string.h>
 #include <uuid/uuid.h>
 
 #include "nfslib.h"