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-rw-r--r--lib/libc/signal/pthread_sigmask.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/libc/signal/pthread_sigmask.c b/lib/libc/signal/pthread_sigmask.c
index 1b83e1fe..4fcc278f 100644
--- a/lib/libc/signal/pthread_sigmask.c
+++ b/lib/libc/signal/pthread_sigmask.c
@@ -1,6 +1,7 @@
#include <errno.h>
#include <asm-generic/signal.h>
#include <libc.h>
+#include <stddef.h>
int sigdelset(sigset_t *, int);
int sigismember(const sigset_t *, int);