diff --git a/clang-13.0.0-arm-add-latomic.patch b/clang-13.0.0-arm-add-latomic.patch
new file mode 100644
index 0000000..a7fe887
--- /dev/null
+++ b/clang-13.0.0-arm-add-latomic.patch
@@ -0,0 +1,10 @@
+--- clang-13.0.0.src/tools/extra/clangd/CMakeLists.txt.orig	2021-11-02 16:57:53.561981660 +0100
++++ clang-13.0.0.src/tools/extra/clangd/CMakeLists.txt	2021-11-02 16:58:11.225804323 +0100
+@@ -168,6 +168,7 @@
+   clangTidy
+ 
+   clangdSupport
++  atomic
+   )
+ if(CLANGD_TIDY_CHECKS)
+   target_link_libraries(clangDaemon PRIVATE ${ALL_CLANG_TIDY_CHECKS})
diff --git a/clang.spec b/clang.spec
index 9e955b3..b8df6e4 100644
--- a/clang.spec
+++ b/clang.spec
@@ -2,8 +2,8 @@
 %define MAJver %(echo %version | cut -d. -f1)
 %define majver %(echo %version | cut -d. -f1-2)
 Name:          clang
-Version:       11.1.0
-Release:       3mamba
+Version:       13.0.0
+Release:       1mamba
 Summary:       C language family frontend for LLVM
 Group:         Development/Languages
 Vendor:        openmamba
@@ -12,6 +12,7 @@ Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           https://llvm.org/
 Source0:       https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}/clang-%{version}.src.tar.xz
 Source1:       https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}/clang-tools-extra-%{version}.src.tar.xz
+Patch0:        clang-13.0.0-arm-add-latomic.patch
 License:       NCSA
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
@@ -66,21 +67,22 @@ This package includes the lib%{name} API documentation.
 
 %prep
 %setup -q -a1 -n %{name}-%{version}.src
-#% setup -q -n %{name}-%{version}.src
-#-D -T
+#% setup -q -n %{name}-%{version}.src -D -T
 #:<< _EOF
-
 mv clang-tools-extra-%{version}.src tools/extra
 
+%ifarch arm
+%patch0 -p1
+%endif
+
 %build
 #:<< __EOF
-
 mkdir -p build
 cd build
 
 cmake .. -G Ninja \
     -DCMAKE_BUILD_TYPE=Release \
-    -DCMAKE_INSTALL_PREFIX=/usr \
+    -DCMAKE_INSTALL_PREFIX=%{_prefix} \
     -DPYTHON_EXECUTABLE=/usr/bin/python \
     -DBUILD_SHARED_LIBS=ON \
     -DLLVM_LINK_LLVM_DYLIB=ON \
@@ -95,7 +97,7 @@ cmake .. -G Ninja \
     -DSPHINX_WARNINGS_AS_ERRORS=OFF
 
 #-DLLVM_MAIN_SRC_DIR="$srcdir/llvm-$pkgver.src"
-
+:<< __EOF
 ninja %{_smp_mflags}
 
 %install
@@ -107,22 +109,18 @@ ninja install
 
 rm -f %{buildroot}%{_datadir}/doc/clang/html/.buildinfo
 
-# legacy libclang.so.11 symlink to libclang.so.11.1
-ln -s libclang.so.%{majver} %{buildroot}%{_libdir}/libclang.so.%{MAJver}
+## legacy libclang.so.11 symlink to libclang.so.11.1
+#ln -s libclang.so.%{majver} %{buildroot}%{_libdir}/libclang.so.%{MAJver}
 
 %clean
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 
-%post
-/sbin/ldconfig
-:
-
-%postun
-/sbin/ldconfig
-:
+%post -n lib%{name} -p /sbin/ldconfig
+%postun -n lib%{name} -p /sbin/ldconfig
 
 %files
 %defattr(-,root,root)
+%{_bindir}/analyze-build
 %{_bindir}/c-index-test
 %{_bindir}/clang
 %{_bindir}/clang++
@@ -132,15 +130,19 @@ ln -s libclang.so.%{majver} %{buildroot}%{_libdir}/libclang.so.%{MAJver}
 %{_bindir}/find-all-symbols
 %{_bindir}/git-clang-format
 %{_bindir}/hmaptool
+%{_bindir}/intercept-build
 %{_bindir}/modularize
 %{_bindir}/pp-trace
+%{_bindir}/run-clang-tidy
 %{_bindir}/scan-build
+%{_bindir}/scan-build-py
 %{_bindir}/scan-view
-%{_prefix}/libexec/c++-analyzer
-%{_prefix}/libexec/ccc-analyzer
-%dir %{_libdir}/clang
-#%dir %{_libdir}/clang/%{version}
-#%{_libdir}/clang/%{version}/*
+%dir %{_prefix}/lib/libear
+%{_prefix}/lib/libear/*
+%dir %{_prefix}/lib/libscanbuild
+%{_prefix}/lib/libscanbuild/*
+# FIXME: should be libexec64 on 64 bits archs
+%{_prefix}/libexec/*
 %dir %{_datadir}/clang/
 %{_datadir}/clang/*
 %dir %{_datadir}/scan-build
@@ -151,12 +153,12 @@ ln -s libclang.so.%{majver} %{buildroot}%{_libdir}/libclang.so.%{MAJver}
 %{_mandir}/man1/diagtool.1*
 %{_mandir}/man1/extraclangtools.1*
 %{_mandir}/man1/scan-build.1*
-%doc LICENSE.TXT
 
 %files -n lib%{name}
 %defattr(-,root,root)
 %{_libdir}/libclang*.so.*
 %{_libdir}/libfindAllSymbols.so.*
+%doc LICENSE.TXT
 
 %files -n lib%{name}-devel
 %defattr(-,root,root)
@@ -168,6 +170,8 @@ ln -s libclang.so.%{majver} %{buildroot}%{_libdir}/libclang.so.%{MAJver}
 %{_includedir}/clang-tidy/*
 %{_libdir}/libclang*.so
 %{_libdir}/libfindAllSymbols.so
+%dir %{_libdir}/clang
+%dir %{_libdir}/clang/%{version}
 %dir %{_libdir}/clang/%{version}/include
 %{_libdir}/clang/%{version}/include/*
 %dir %{_libdir}/cmake/clang
@@ -182,6 +186,9 @@ ln -s libclang.so.%{majver} %{buildroot}%{_libdir}/libclang.so.%{MAJver}
 %{_docdir}/clang-tools/*
 
 %changelog
+* Fri Oct 22 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 13.0.0-1mamba
+- update to 13.0.0
+
 * Mon May 17 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 11.1.0-3mamba
 - rebuilt with -DCLANG_LINK_CLANG_DYLIB=ON