import: include unistd.h for pipe2

This is needed for e.g. pipe2 and unlinkat and a build failure
is reproducible when libarchive support is disabled.

diff --git a/src/import/import-common.c b/src/import/import-common.c
index 2fb781442a18ef7c6b3f91cf546763ce07e576bf..28a913fdb73cf04169a5bf5cf39b4c5f04e50a8f 100644 (file)
--- a/src/import/import-common.c
+++ b/src/import/import-common.c
@@ -2,6 +2,7 @@
 
 #include <sched.h>
 #include <sys/prctl.h>
+#include <unistd.h>
 
 #include "sd-event.h"