Use the struct hack, this time with standard spelling:

--- ldif.c	2009-08-18 23:58:27
+++ ldif.c	2009-09-24 15:12:12
@@ -593,8 +593,8 @@ typedef struct bvlist {
 	char *trunc;	/* filename was truncated here */
 	int  inum;		/* num from "attr={num}" in filename, or INT_MIN */
 	char savech;	/* original char at *trunc */
-	char fname;		/* variable length array BVL_NAME(bvl) = &fname */
-#	define BVL_NAME(bvl) ((char *) (bvl) + offsetof(bvlist, fname))
+	char fname[1];	/* variable length array BVL_NAME(bvl) = fname[] */
+#	define BVL_NAME(bvl)     ((bvl)->fname)
 #	define BVL_SIZE(namelen) (sizeof(bvlist) + (namelen))
 } bvlist;