diff --git a/libzypp-17.21.0.tar.bz2 b/libzypp-17.21.0.tar.bz2
index e694cbc..a3c2106 100644
--- a/libzypp-17.21.0.tar.bz2
+++ b/libzypp-17.21.0.tar.bz2
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:f5070a1f81fdac422315aacec28ec963c0a151293abb1b65d78604ea23e8f8a8
-size 4741075
+oid sha256:93273080b6ddcef38b7b821e6d1c116f19375d407cbc63412ea9eb167bc02d06
+size 4744256
diff --git a/libzypp.spec b/libzypp.spec
index 26daff8..e090802 100644
--- a/libzypp.spec
+++ b/libzypp.spec
@@ -16,6 +16,12 @@
 #
 
 
+%if 0%{?is_opensuse} && (0%{?sle_version} >= 150000 || 0%{?suse_version} >= 1500)
+%bcond_without zchunk
+%else
+%bcond_with zchunk
+%endif
+
 Name:           libzypp
 Version:        17.21.0
 Release:        0
@@ -129,6 +135,10 @@ BuildRequires:  asciidoc
 BuildRequires:  libxslt-tools
 %endif
 
+%if %{with zchunk}
+BuildRequires:  libzck-devel
+%endif
+
 %description
 libzypp is the package management library that powers applications
 like YaST, zypper and the openSUSE/SLE implementation of PackageKit.
@@ -220,6 +230,7 @@ cmake -DCMAKE_INSTALL_PREFIX=%{_prefix} \
       -DLIB=%{_lib} \
       -DCMAKE_BUILD_TYPE=Release \
       -DCMAKE_SKIP_RPATH=1 \
+      %{?with_zchunk:-DENABLE_ZCHUNK_COMPRESSION=1} \
       ${EXTRA_CMAKE_OPTIONS} \
       ..
 make %{?_smp_mflags} VERBOSE=1