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-rw-r--r--src/common/mythread.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/common/mythread.h b/src/common/mythread.h
index 7a68da8f..be226542 100644
--- a/src/common/mythread.h
+++ b/src/common/mythread.h
@@ -81,6 +81,8 @@ do { \
#if !(defined(_WIN32) && !defined(__CYGWIN__))
// Use sigprocmask() to set the signal mask in single-threaded programs.
+#include <signal.h>
+
static inline void
mythread_sigmask(int how, const sigset_t *restrict set,
sigset_t *restrict oset)