diff --git a/klee-rpmlintrc b/klee-rpmlintrc
index 67d25fd..9001dca 100644
--- a/klee-rpmlintrc
+++ b/klee-rpmlintrc
@@ -1 +1,2 @@
 addFilter("devel-file-in-non-devel-package")
+addFilter("shlib-policy-name-error.*libkleeRuntest1_0")
diff --git a/klee.changes b/klee.changes
index e912e4b..c0ebbcc 100644
--- a/klee.changes
+++ b/klee.changes
@@ -1,3 +1,15 @@
+-------------------------------------------------------------------
+Thu Feb 13 06:38:42 UTC 2025 - Jiri Slaby <jslaby@suse.cz>
+
+- OK, bump to llvm 15 again, everything moved to 15 in the meantime
+
+-------------------------------------------------------------------
+Tue Feb 11 08:49:12 UTC 2025 - Jiri Slaby <jslaby@suse.cz>
+
+- support old distros
+  * use gcc-14 c++ headers
+  * add rpmlintrc filter for libkleeRuntest1_0
+
 -------------------------------------------------------------------
 Mon Feb 03 12:05:59 UTC 2025 - jslaby@suse.cz
 
diff --git a/klee.spec b/klee.spec
index 42c41c0..2f0e6ca 100644
--- a/klee.spec
+++ b/klee.spec
@@ -16,7 +16,7 @@
 #
 
 
-%define llvm_version 14
+%define llvm_version 15
 
 %ifarch x86_64
 %define with_uclibc 1
@@ -40,6 +40,9 @@ Source3:        https://raw.githubusercontent.com/llvm/llvm-project/llvmorg-%{ll
 
 BuildRequires:  clang%{llvm_version}
 BuildRequires:  cmake
+%if 0%{suse_version} < 1600
+BuildRequires:  gcc14-c++
+%endif
 BuildRequires:  gperftools-devel
 %if %{with_uclibc}
 BuildRequires:  klee-uclibc-devel-static(llvm%{llvm_version})