diff --git a/mold.changes b/mold.changes
index 4560d7c..e625966 100644
--- a/mold.changes
+++ b/mold.changes
@@ -1,3 +1,13 @@
+-------------------------------------------------------------------
+Tue Dec 21 17:04:56 UTC 2021 - Martin Liška <mliska@suse.cz>
+
+- Ignore -Wno-sign-compare for now.
+
+-------------------------------------------------------------------
+Tue Dec 21 16:35:38 UTC 2021 - Martin Liška <mliska@suse.cz>
+
+- Use system package for tbb and xxhash.
+
 -------------------------------------------------------------------
 Tue Dec 21 15:03:07 UTC 2021 - Mark Nefedov <mark_nefedov@runbox.com>
 
diff --git a/mold.spec b/mold.spec
index dc05cde..3f3bf23 100644
--- a/mold.spec
+++ b/mold.spec
@@ -28,8 +28,11 @@ BuildRequires:  gcc-c++
 BuildRequires:  openssl-devel
 BuildRequires:  xxhash-devel
 BuildRequires:  zlib-devel
+BuildRequires:  tbb-devel
 PreReq:         update-alternatives
 
+%define build_args "SYSTEM_TBB=1 SYSTEM_XXHASH=1"
+
 %description
 mold is a faster drop-in replacement for existing Unix linkers.
 It is several times faster than LLVM lld linker, the second-fastest
@@ -43,19 +46,18 @@ build time especially in rapid debug-edit-rebuild cycles.
 %build
 export CC=gcc
 export CXX=g++
-export CFLAGS="%{optflags}"
+export CFLAGS="%{optflags} -Wno-sign-compare"
 export CXXFLAGS="${CFLAGS}"
-
 export MANDIR=%{_mandir}
 export LIBDIR=%{_libdir}
 export BINDIR=%{_bindir}
-%make_build
+%make_build %{build_args}
 
 %install
 export MANDIR=%{_mandir}
 export LIBDIR=%{_libdir}
 export BINDIR=%{_bindir}
-%make_install
+%make_install %{build_args}
 
 %post
 "%_sbindir/update-alternatives" --install \