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-rw-r--r--libc/sysdeps/linux/common/sigaltstack.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/sigaltstack.c b/libc/sysdeps/linux/common/sigaltstack.c
index 4267c747c..624c87792 100644
--- a/libc/sysdeps/linux/common/sigaltstack.c
+++ b/libc/sysdeps/linux/common/sigaltstack.c
@@ -9,5 +9,8 @@
#include <sys/syscall.h>
#include <signal.h>
+
+#ifdef __NR_sigaltstack
_syscall2(int, sigaltstack, const struct sigaltstack *, ss,
struct sigaltstack *, oss);
+#endif