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-rw-r--r--src/thread.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/thread.h b/src/thread.h
index cb2133d72d4..19baafbf8a1 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -25,6 +25,10 @@ along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#include <sys/socket.h>
#endif
+#ifdef MSDOS
+#include <signal.h> /* sigset_t */
+#endif
+
#include "sysselect.h" /* FIXME */
#include "systime.h" /* FIXME */
#include "systhread.h"