include ac/unistd.h to avoid compiler warnings

diff --git a/libraries/liblutil/entropy.c b/libraries/liblutil/entropy.c
index 13e9d9dd25c64f0ab9f829fae3a5458c2d56be84..eb3209ec397482631293e046fe60c0f1cb5b3da5 100644 (file)
--- a/libraries/liblutil/entropy.c
+++ b/libraries/liblutil/entropy.c
@@ -8,6 +8,7 @@
 
 #include <ac/string.h>
 #include <ac/time.h>
+#include <ac/unistd.h>
 
 #ifdef HAVE_WINCRYPT_H
 #include <wincrypt.h>