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--- a/extvars.h
+++ b/extvars.h
@@ -129,10 +129,10 @@ extern int numb_moves;
extern int phase;
-FILE *lrn_standard;
-FILE *lrn_zh;
-FILE *lrn_suicide;
-FILE *lrn_losers;
+extern FILE *lrn_standard;
+extern FILE *lrn_zh;
+extern FILE *lrn_suicide;
+extern FILE *lrn_losers;
extern int bestmovenum;
extern int ugly_ep_hack;
--- a/proof.c
+++ b/proof.c
@@ -48,7 +48,7 @@ long frees;
int iters;
int forwards;
int maxply;
-int ply;
+extern int ply;
int pn_time;
move_s pn_move;
move_s pn_saver;
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