Index: src/tests/avltree/avl.h
===================================================================
--- src/tests/avltree/avl.h	(revision 3dcd347a4c5f8c100391138bbb76f5e1368092a1)
+++ src/tests/avltree/avl.h	(revision f96b061a0c32b7d62a02f5ad4df3a87e9cb19abc)
@@ -6,5 +6,4 @@
 void free(void *);
 #define assert(cond) if (! (cond)) { printf("Assertion failed: (%s) at %s:%d\n", #cond, __FILE__, __LINE__); abort(); }
-void abort();
 int printf(const char *, ...);
 }