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-rw-r--r--src/libmain/shared.hh6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/libmain/shared.hh b/src/libmain/shared.hh
index 2c574d148f6b..fa45645fef40 100644
--- a/src/libmain/shared.hh
+++ b/src/libmain/shared.hh
@@ -3,6 +3,8 @@
 
 #include "types.hh"
 
+#include <signal.h>
+
 
 /* These are not implemented here, but must be implemented by a
    program linking against libmain. */
@@ -27,6 +29,10 @@ void printGCWarning();
 /* Whether we're running setuid. */
 extern bool setuidMode;
 
+extern volatile ::sig_atomic_t blockInt;
+
+MakeError(UsageError, nix::Error)
+
 }