Enable LZMA as a secondary compression algorithm in sysutils/xdelta.

liblzma could already have been picked up as a hidden dependency.
Make this dependency explicit and enable the feature.

Get rid of a commented CONFIGURE_STYLE while here, by Kurt's request.

ok kmos@

sysutils/xdelta/Makefile

@@ -4,6 +4,7 @@ COMMENT =		tool for RFC3284 delta compression
 GH_ACCOUNT =		jmacd
 GH_PROJECT =		xdelta
 GH_TAGNAME =		v3.0.11
+REVISION =		0
 
 CATEGORIES =		sysutils devel
 
@@ -19,11 +20,14 @@ WRKSRC = 		${WRKDIST}/xdelta3
 PERMIT_PACKAGE =	Yes
 
 # C++ is only for disabled regression test suite
-WANTLIB =		c m
+WANTLIB =		c lzma m pthread
+
+LIB_DEPENDS =		archivers/xz
 
-#CONFIGURE_STYLE =	autoconf
 CONFIGURE_STYLE =	autoreconf
 
+CONFIGURE_ARGS =	--with-liblzma=yes
+
 AUTOCONF_VERSION =	2.69
 AUTOMAKE_VERSION =	1.15
 

sysutils/xdelta/patches/patch-xdelta3_configure_ac

@@ -0,0 +1,19 @@
+Index: xdelta3/configure.ac
+--- xdelta3/configure.ac.orig
++++ xdelta3/configure.ac
+@@ -22,7 +22,15 @@ AC_ARG_WITH(
+     [USE_LIBLZMA=$withval],
+     [USE_LIBLZMA=auto])
+ 
++AC_PATH_PROG(PKG_CONFIG, pkg-config)
++
+ if test "x$USE_LIBLZMA" != xno ; then
++    if test -n "$PKG_CONFIG"; then
++        LZMA_CFLAGS="`$PKG_CONFIG --cflags liblzma`"
++        CFLAGS="$CFLAGS $LZMA_CFLAGS"
++        LZMA_LDFLAGS="`$PKG_CONFIG --libs liblzma`"
++        LDFLAGS="$LDFLAGS $LZMA_LDFLAGS"
++    fi
+     AC_CHECK_HEADERS([lzma.h],,[
+         if test "x$with_liblzma" = xyes ; then
+             AC_MSG_FAILURE([liblzma includes were not found])