diff -uNr qemu-4.0.0/linux-user/aarch64/signal.c qemu-4.0.0.mod/linux-user/aarch64/signal.c
--- qemu-4.0.0/linux-user/aarch64/signal.c	2019-04-23 21:14:46.000000000 +0300
+++ qemu-4.0.0.mod/linux-user/aarch64/signal.c	2019-04-27 15:15:35.724365997 +0300
@@ -38,7 +38,7 @@
     target_stack_t tuc_stack;
     target_sigset_t tuc_sigmask;
     /* glibc uses a 1024-bit sigset_t */
-    char __unused[1024 / 8 - sizeof(target_sigset_t)];
+    char __qemu_unused[1024 / 8 - sizeof(target_sigset_t)];
     /* last for future expansion */
     struct target_sigcontext tuc_mcontext;
 };
diff -uNr qemu-4.0.0/linux-user/arm/signal.c qemu-4.0.0.mod/linux-user/arm/signal.c
--- qemu-4.0.0/linux-user/arm/signal.c	2019-04-23 21:14:46.000000000 +0300
+++ qemu-4.0.0.mod/linux-user/arm/signal.c	2019-04-27 15:15:48.572413658 +0300
@@ -59,7 +59,7 @@
     target_stack_t tuc_stack;
     struct target_sigcontext tuc_mcontext;
     target_sigset_t  tuc_sigmask;       /* mask last for extensibility */
-    char __unused[128 - sizeof(target_sigset_t)];
+    char __qemu_unused[128 - sizeof(target_sigset_t)];
     abi_ulong tuc_regspace[128] __attribute__((__aligned__(8)));
 };
 
diff -uNr qemu-4.0.0/linux-user/syscall_defs.h qemu-4.0.0.mod/linux-user/syscall_defs.h
--- qemu-4.0.0/linux-user/syscall_defs.h	2019-04-23 21:14:46.000000000 +0300
+++ qemu-4.0.0.mod/linux-user/syscall_defs.h	2019-04-27 15:15:06.028256027 +0300
@@ -1731,7 +1731,7 @@
        abi_ulong    target_st_mtime_nsec;
        abi_ulong    target_st_ctime;
        abi_ulong    target_st_ctime_nsec;
-       abi_long     __unused[3];
+       abi_long     __qemu_unused[3];
 };
 
 #elif defined(TARGET_SH4)
@@ -1816,7 +1816,7 @@
 	abi_ulong	target_st_ctime;
 	abi_ulong       target_st_ctime_nsec;
 
-	abi_long	__unused[3];
+	abi_long	__qemu_unused[3];
 };
 #elif defined(TARGET_S390X)
 struct target_stat {
@@ -1837,7 +1837,7 @@
     abi_ulong  target_st_ctime_nsec;
     abi_ulong  st_blksize;
     abi_long       st_blocks;
-    abi_ulong  __unused[3];
+    abi_ulong  __qemu_unused[3];
 };
 #elif defined(TARGET_AARCH64)
 struct target_stat {
@@ -1859,7 +1859,7 @@
     abi_ulong  target_st_mtime_nsec;
     abi_long  target_st_ctime;
     abi_ulong  target_st_ctime_nsec;
-    unsigned int __unused[2];
+    unsigned int __qemu_unused[2];
 };
 #elif defined(TARGET_XTENSA)
 struct target_stat {