privsep: Fix compile on alpine linux

diff --git a/src/privsep-control.c b/src/privsep-control.c
index bb083632bea1ec1d4a0cf74eae8bcc1218becdc6..f54ded09f454fb7588eddc9801f5c176989b4101 100644 (file)
--- a/src/privsep-control.c
+++ b/src/privsep-control.c
@@ -27,6 +27,7 @@
  */
 
 #include <errno.h>
+#include <signal.h>
 #include <stdlib.h>
 #include <string.h>