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-rw-r--r--include/mrbconf.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/mrbconf.h b/include/mrbconf.h
index 0caa3f90e..988bdf0ad 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -8,6 +8,7 @@
#define MRUBYCONF_H
#include <stdint.h>
+#include <stddef.h>
/* configuration options: */
/* add -DMRB_USE_FLOAT to use float instead of double for floating point numbers */