* Doh.

src/libmain/shared.cc

@@ -207,6 +207,9 @@ static void initAndRun(int argc, char * * argv)
 }
 
 
+bool setuidMode = false;
+
+
 static void setuidInit()
 {
     /* Don't do anything if this is not a setuid binary. */

src/libmain/shared.hh

@@ -25,7 +25,7 @@ Path makeRootName(const Path & gcRoot, int & counter);
 void printGCWarning();
 
 /* Whether we're running setuid. */
-bool setuidMode = false;
+extern bool setuidMode;
 
 }