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-rw-r--r--tools/alg-test.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/alg-test.c b/tools/alg-test.c
index 48f0a56f..a7404b74 100644
--- a/tools/alg-test.c
+++ b/tools/alg-test.c
@@ -23,6 +23,7 @@
#include <config.h>
#endif
+#define _GNU_SOURCE
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>