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-rw-r--r--cmdline/apt-mark.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/cmdline/apt-mark.cc b/cmdline/apt-mark.cc
index dbbef5013..c7d9b6f6a 100644
--- a/cmdline/apt-mark.cc
+++ b/cmdline/apt-mark.cc
@@ -16,6 +16,7 @@
#include <apt-pkg/pkgsystem.h>
#include <algorithm>
+#include <unistd.h>
#include <apti18n.h>
/*}}}*/