diff --git a/core/clingutils/CMakeLists.txt b/core/clingutils/CMakeLists.txt
index ec4024f1d9b14..f63e4cea944cf 100644
--- a/core/clingutils/CMakeLists.txt
+++ b/core/clingutils/CMakeLists.txt
@@ -85,7 +85,13 @@ if (builtin_clang)
   set(CLANG_RESOURCE_DIR_STEM ${CMAKE_BINARY_DIR}/interpreter/llvm-project/llvm/${CMAKE_CFG_INTDIR}/lib/clang)
   set(CLANG_RESOURCE_DIR_VERSION ${LLVM_VERSION_MAJOR})
 else ()
-  set(CLANG_RESOURCE_DIR_STEM ${LLVM_LIBRARY_DIR}/clang)
+  # If Clang was installed standalone (in particular, not in the LLVM tree),
+  # use the CLANG_INSTALL_PREFIX variable to indicate where it is.
+  if(DEFINED CLANG_INSTALL_PREFIX)
+    set(CLANG_RESOURCE_DIR_STEM ${CLANG_INSTALL_PREFIX}/lib/clang)
+  else()
+    set(CLANG_RESOURCE_DIR_STEM ${LLVM_LIBRARY_DIR}/clang)
+  endif()
   # A user can define a clang version to use, otherwise find it (but will error if more than one version is present)
   if (NOT DEFINED CLANG_RESOURCE_DIR_VERSION)
     if (NOT EXISTS ${CLANG_RESOURCE_DIR_STEM})