diff --git a/libclc.changes b/libclc.changes
index 5cb6e27..7a53876 100644
--- a/libclc.changes
+++ b/libclc.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Sep 29 12:44:19 UTC 2021 - Stefan Dirsch <sndirsch@suse.com>
+
+- fixed broken %{_llvm_sonum} in libcl(llvm%{_llvm_sonum}) Provides
+  by buildrequiring appropriate llvm/clang -devel packages
+
 -------------------------------------------------------------------
 Wed Sep 29 12:00:22 UTC 2021 - Stefan Dirsch <sndirsch@suse.com>
 
diff --git a/libclc.spec b/libclc.spec
index e12dff0..68a68b2 100644
--- a/libclc.spec
+++ b/libclc.spec
@@ -27,9 +27,19 @@ Group:          Development/Libraries/C and C++
 URL:            https://libclc.llvm.org/
 Source0:        https://github.com/llvm/llvm-project/releases/download/llvmorg-%{_libclc_llvm_ver}/%{name}-%{_libclc_llvm_ver}.src.tar.xz
 Source1:        %{name}-rpmlintrc
-BuildRequires:  clang-devel >= 4.0
 BuildRequires:  cmake
-BuildRequires:  llvm >= 4.0
+%if 0%{?suse_version} >= 1550
+BuildRequires:  clang-devel
+BuildRequires:  llvm-devel
+%else
+%if 0%{?sle_version} >= 150300
+BuildRequires:  clang11-devel
+BuildRequires:  llvm11-devel
+%else
+BuildRequires:  clang9-devel
+BuildRequires:  llvm9-devel
+%endif
+%endif
 BuildRequires:  python3-base
 Provides:       libclc(llvm%{_llvm_sonum})
 BuildArch:      noarch