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--- a/sigscheme/libgcroots/include/private/gc_priv.h
+++ b/sigscheme/libgcroots/include/private/gc_priv.h
@@ -1979,7 +1979,7 @@
/* the signal mask. */
# define SETJMP(env) sigsetjmp(env, 1)
# define LONGJMP(env, val) siglongjmp(env, val)
-# define JMP_BUF sigjmp_buf
+# define JMP_BUF extern sigjmp_buf
#else
# ifdef ECOS
# define SETJMP(env) hal_setjmp(env)
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