diff -ur rpm-4.5.orig/build/parsePrep.c rpm-4.5/build/parsePrep.c
--- rpm-4.5.orig/build/parsePrep.c	2014-07-29 17:12:39.000000000 +0000
+++ rpm-4.5/build/parsePrep.c	2014-07-29 17:14:38.749000000 +0000
@@ -148,6 +148,9 @@
 	case COMPRESSED_LZMA:
 	    zipper = "%{__lzma}";
 	    break;
+	case COMPRESSED_XZ:
+	    zipper = "%{__xz}";
+	    break;
 	}
 	zipper = rpmGetPath(zipper, NULL);
 
@@ -251,6 +254,9 @@
 	case COMPRESSED_LZMA:
 	    t = "%{__lzma} -dc";
 	    break;
+	case COMPRESSED_XZ:
+	    t = "%{__xz} -dc";
+	    break;
 	case COMPRESSED_ZIP:
 	    if (rpmIsVerbose() && !quietly)
 		t = "%{__unzip}";
diff -ur rpm-4.5.orig/rpmio/macro.c rpm-4.5/rpmio/macro.c
--- rpm-4.5.orig/rpmio/macro.c	2014-07-29 17:12:39.000000000 +0000
+++ rpm-4.5/rpmio/macro.c	2014-07-29 17:13:17.613000000 +0000
@@ -1241,10 +1241,13 @@
 	    sprintf(be, "%%__unzip -qq %s", b);
 	    break;
 	case 4:	/* COMPRESSED_LZOP */
-	    sprintf(be, "%%__lzop %s", b);
+	    sprintf(be, "%%__lzop -dc %s", b);
 	    break;
 	case 5:	/* COMPRESSED_LZMA */
-	    sprintf(be, "%%__lzma %s", b);
+	    sprintf(be, "%%__lzma -dc %s", b);
+	    break;
+	case 6:	/* COMPRESSED_XZ */
+	    sprintf(be, "%%__xz -dc %s", b);
 	    break;
 	}
 	b = be;
@@ -2257,6 +2260,13 @@
 	magic[11] == 0x00 && magic[12] == 0x00)	/* lzmash */
 	*compressed = COMPRESSED_LZMA;
     else
+    if (magic[0] == 0135 && magic[1] == 0 && magic[2] == 0)	/* lzma */
+	*compressed = COMPRESSED_LZMA;
+    else
+    if (magic[0] == 0xFD && magic[1] == 0x37 && magic[2] == 0x7A
+     && magic[3] == 0x58 && magic[4] == 0x5A && magic[5] == 0x00)	/* xz */
+	*compressed = COMPRESSED_XZ;
+    else
     if ((magic[0] == 0037 && magic[1] == 0213)	/* gzip */
      ||	(magic[0] == 0037 && magic[1] == 0236)	/* old gzip */
      ||	(magic[0] == 0037 && magic[1] == 0036)	/* pack */
diff -ur rpm-4.5.orig/rpmio/rpmmacro.h rpm-4.5/rpmio/rpmmacro.h
--- rpm-4.5.orig/rpmio/rpmmacro.h	2014-07-29 17:12:39.000000000 +0000
+++ rpm-4.5/rpmio/rpmmacro.h	2014-07-29 17:13:17.613000000 +0000
@@ -170,7 +170,8 @@
     COMPRESSED_BZIP2		= 2,	/*!< bzip2 can handle */
     COMPRESSED_ZIP		= 3,	/*!< unzip can handle */
     COMPRESSED_LZOP		= 4,	/*!< lzop can handle */
-    COMPRESSED_LZMA		= 5	/*!< lzma can handle */
+    COMPRESSED_LZMA		= 5,	/*!< lzma can handle */
+    COMPRESSED_XZ		= 6	/*!< xz can handle */
 } rpmCompressedMagic;
 
 /**