Index: build/pack.c
===================================================================
--- build/pack.c.orig
+++ build/pack.c
@@ -379,7 +379,9 @@ rpmRC writeRPM(Header *hdrp, unsigned ch
 	const char *compr = NULL;
 	headerPutString(h, RPMTAG_PAYLOADFORMAT, "cpio");
 
-	if (strcmp(s+1, "gzdio") == 0) {
+	if (strcmp(s+1, "ufdio") == 0) {
+	    compr = NULL;
+	} else if (strcmp(s+1, "gzdio") == 0) {
 	    compr = "gzip";
 #if HAVE_BZLIB_H
 	} else if (strcmp(s+1, "bzdio") == 0) {
@@ -402,7 +404,8 @@ rpmRC writeRPM(Header *hdrp, unsigned ch
 	    goto exit;
 	}
 
-	headerPutString(h, RPMTAG_PAYLOADCOMPRESSOR, compr);
+	if (compr)
+	    headerPutString(h, RPMTAG_PAYLOADCOMPRESSOR, compr);
 	buf = xstrdup(rpmio_flags);
 	buf[s - rpmio_flags] = '\0';
 	headerPutString(h, RPMTAG_PAYLOADFLAGS, buf+1);