diff --git a/openvdb.spec b/openvdb.spec
index 42e3d57..968c297 100644
--- a/openvdb.spec
+++ b/openvdb.spec
@@ -10,6 +10,12 @@
 # Optional supports
 %global with_openexr 1
 %global with_ax      0
+%global with_nanovdb 1
+
+# ax currently incompatible with newer llvm versions
+%if 0%{?fedora} >= 38 || 0%{?rhel} >= 8
+%global llvm_compat 15
+%endif
 
 Name:           openvdb
 Version:        11.0.0
@@ -36,7 +42,7 @@ BuildRequires:  gcc-c++
 BuildRequires:  ghostscript >= 8.70
 BuildRequires:  libstdc++-devel
 %if 0%{?with_ax}
-BuildRequires:	llvm-devel
+BuildRequires:  llvm%{?llvm_compat}-devel
 BuildRequires:	pkgconfig(libffi)
 %endif
 BuildRequires:  pkgconfig(blosc) >= 1.5.0
@@ -129,9 +135,15 @@ sed -i \
 export CXXFLAGS="%{build_cxxflags} -Wl,--as-needed"
 
 # Ignore versions (python 3, etc.)
+# Set ABI version to address blender compatibility for
+# Fedora 40 and onward
 %cmake \
     -DCMAKE_NO_SYSTEM_FROM_IMPORTED=TRUE \
     -DDISABLE_DEPENDENCY_VERSION_CHECKS=ON \
+%if 0%{?fedora} > 39
+    -DOPENVDB_ABI_VERSION_NUMBER=10 \
+    -DOPENVDB_USE_DEPRECATED_ABI_10=ON \
+%endif
     -DOPENVDB_BUILD_DOCS=ON \
 %if 0%{?fedora}
     -DOPENVDB_BUILD_PYTHON_MODULE=ON \
@@ -145,12 +157,18 @@ export CXXFLAGS="%{build_cxxflags} -Wl,--as-needed"
 %if 0%{?with_ax}
     -DHAVE_FFI_CALL=ON \
     -DUSE_AX=ON \
+    -DLLVM_STATIC=0 \
+    -DLLVM_CONFIG=$(which llvm-config%{?llvm_compat:-%{llvm_compat}}) \
+    -DLLVM=%{_bindir} \
 %endif
 %if 0%{?with_openexr}
     -DUSE_EXR=ON \
 %endif
-    -DUSE_NANOVDB=ON
-
+%if 0%{?with_nanovdb}
+    -DUSE_NANOVDB=ON \
+    -DOPENVDB_BUILD_NANOVDB=ON \
+    -DNANOVDB_USE_OPENVDB=ON
+%endif
 # Increase memory reserve to 12GB per build thread for a successful build on
 # ppc64le and s390x.
 %cmake_build %limit_build -m 12288
@@ -171,7 +189,7 @@ find %{buildroot} -name '*.a' -delete
 
 %files
 %{_bindir}/vdb_print
-%{_bindir}/nanovdb_{print,validate}
+%{_bindir}/nanovdb_{convert,print,validate}
 
 %files libs
 %license LICENSE