Author: Jed Davis <jld@mozilla.com>
Date:   Thu Feb 12 20:44:26 2026 -0800

    Bug 2016618 - Fix Linux sandbox build breakage on glibc 2.43

diff --git a/sandbox/linux/system_headers/linux_seccomp.h b/sandbox/linux/system_headers/linux_seccomp.h
index 8690a96eb01b..981005faf06f 100644
--- a/sandbox/linux/system_headers/linux_seccomp.h
+++ b/sandbox/linux/system_headers/linux_seccomp.h
@@ -5,6 +5,7 @@
 #ifndef SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SECCOMP_H_
 #define SANDBOX_LINUX_SYSTEM_HEADERS_LINUX_SECCOMP_H_
 
+#include <signal.h>  // for SYS_SECCOMP
 #include <stdint.h>
 #include <sys/ioctl.h>