diff -r 2e8a0b26d579 -r 4204db81cdbc configure.ac
--- a/configure.ac	Sat Jun 11 17:56:45 2016 +0100
+++ b/configure.ac	Thu Jul 07 15:17:29 2016 +0100
@@ -205,6 +205,25 @@
 AC_MSG_RESULT($have_gcc4)
 
 REQUIREMENTS=""
+AC_ARG_WITH([libarchive],
+            [AS_HELP_STRING([--without-libarchive],
+	        [disable support for libarchive])],
+            [],
+            [with_libarchive=yes])
+          
+LIBARCHIVE_CFLAGS=
+LIBARCHIVE_LIBS=
+AS_IF([test "x$with_libarchive" != xno],
+  [PKG_CHECK_MODULES(LIBARCHIVE, [libarchive])
+   REQUIREMENTS="$REQUIREMENTS libarchive"
+   AC_DEFINE([HAVE_LIBARCHIVE], [1], [Define if you have libarchive])])
+AC_SUBST(LIBARCHIVE_CFLAGS)
+AC_SUBST(LIBARCHIVE_LIBS)
+
+AS_IF([test "x$with_libarchive" != xno],
+   [AC_PATH_PROG(ZIP, [zip], [])])
+AM_CONDITIONAL([HAVE_ZIP], [test -n "$ZIP"])
+
 AC_ARG_WITH([curl],
             [AS_HELP_STRING([--without-curl], [disable support for curl])],
             [],
@@ -217,6 +236,7 @@
    AC_DEFINE([HAVE_CURL], [1], [Define if you have curl])])
 AC_SUBST(CURL_CFLAGS)
 AC_SUBST(CURL_LIBS)
+AM_CONDITIONAL([HAVE_CURL], [test "x$with_curl" != xno])
 
 ZLIB_LIBS=""
 AC_ARG_WITH(zlib, [  --with-zlib=<dir>       Use zlib from here],