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-rw-r--r--MLKLexicalContext.m2
1 files changed, 2 insertions, 0 deletions
diff --git a/MLKLexicalContext.m b/MLKLexicalContext.m
index 1eaa51c..2af717b 100644
--- a/MLKLexicalContext.m
+++ b/MLKLexicalContext.m
@@ -37,6 +37,8 @@
#import "runtime-compatibility.h"
#import "util.h"
+#include <stdlib.h>
+
#define MAKE_ENVIRONMENT(variable, parent, parent_member) \
[[MLKEnvironment alloc] \