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-rw-r--r--src/lisp.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/lisp.h b/src/lisp.h
index d0c52d85672..8c884dce150 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -3425,8 +3425,11 @@ extern Lisp_Object string_make_unibyte (Lisp_Object);
extern void syms_of_fns (void);
/* Defined in floatfns.c. */
-extern void syms_of_floatfns (void);
+#ifndef HAVE_TRUNC
+extern double trunc (double);
+#endif
extern Lisp_Object fmod_float (Lisp_Object x, Lisp_Object y);
+extern void syms_of_floatfns (void);
/* Defined in fringe.c. */
extern void syms_of_fringe (void);