debugger: fix compiler warning about implicit declaration

diff --git a/src/plugins/debugger/ptracepreload.c b/src/plugins/debugger/ptracepreload.c
index 43f77dd..03f3dbb 100644 (file)
--- a/src/plugins/debugger/ptracepreload.c
+++ b/src/plugins/debugger/ptracepreload.c
@@ -1,4 +1,5 @@
 
+#include <stdio.h>
 #include <unistd.h>
 #include <sys/prctl.h>
 #include <sys/types.h>