diff --git a/mercurial.spec b/mercurial.spec
index 708cfd1..6d6f60c 100644
--- a/mercurial.spec
+++ b/mercurial.spec
@@ -22,11 +22,13 @@ BuildRequires: pkgconfig
 BuildRequires: python3-devel
 BuildRequires: python3-setuptools
 BuildRequires: python3-docutils
+BuildRequires: rust-packaging
 
 Provides: hg = %{version}-%{release}
 Requires: python3
 Requires: emacs-filesystem
 Recommends: python3-fb-re2
+Recommends: mercurial-rust = %{version}-%{release}
 
 %description
 Mercurial is a fast, lightweight source control management system designed
@@ -67,11 +69,43 @@ Mercurial. When you type chg, a C program connects to that background process
 and executes Mercurial commands.
 
 
+%package rust
+Summary:    Mercurial Rust extensions for speeding up certain operations
+Requires:   hg = %{version}-%{release}
+
+%description rust
+The following operations are sped up when using Rust:
+
+    - discovery of differences between repositories (pull/push)
+    - nodemap (see :hg:`help config.format.use-persistent-nodemap`)
+    - all commands using the dirstate (status, commit, diff, add, update, etc.)
+    - dirstate-v2 (see :hg:`help config.format.use-dirstate-v2`)
+    - iteration over ancestors in a graph
+
+More features are in the works, and improvements on the above listed are still
+in progress. For more experimental work see the "rhg" section.
+
+
 %prep
 %setup -q -n %{name}-%{upstreamversion}
+#sed -i setup.py -e "s/'cargo', 'rustc', '--release'/\0, '--offline'/g"
+
+pushd rust
+#autosetup -n %{crate}-%{version_no_tilde} -p1
+echo
+%cargo_prep
+echo
+#generate_buildrequires
+echo
+#cargo_generate_buildrequires -a
+popd
 
 %build
-PYTHON=%{python3} make all
+pushd rust
+%cargo_build -a
+popd
+
+echo PYTHON=%{python3} make all
 
 # chg will invoke the 'hg' command - no direct Python dependency
 pushd contrib/chg
@@ -79,8 +113,12 @@ make
 popd
 
 %install
-%{python3} setup.py install -O1 --root %{buildroot} --prefix %{_prefix} --record=%{name}.files
-make install-doc DESTDIR=%{buildroot} MANDIR=%{_mandir}
+pushd rust
+%cargo_install -a
+popd
+
+echo %{python3} setup.py install -O1 --root %{buildroot} --prefix %{_prefix} --record=%{name}.files
+echo make install-doc DESTDIR=%{buildroot} MANDIR=%{_mandir}
 
 grep -v -e 'hgk.py*' \
         -e "%{python3_sitearch}/mercurial/" \
@@ -176,6 +214,8 @@ pathfix.py -pni "%{python3}" %{buildroot}%{_bindir}/hg-ssh
 %{_bindir}/chg
 %doc %attr(644,root,root) %{_mandir}/man?/chg.*.gz
 
+%files rust
+%{python3_sitearch}/mercurial/rustext.cpython-*-*-linux-gnu.so
 
 #%%check
 # This will now fail everytime. Mercurial is not ported properly for Python3