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--- a/src/utils/closefrom.cpp
+++ b/src/utils/closefrom.cpp
@@ -143,6 +143,9 @@
     closefrom_maxfd = max;
 }
 
+#ifdef sun
+#include <limits.h>
+#endif
 int libclf_closefrom(int fd0)
 {
     int i, maxfd = closefrom_maxfd;