diff --git a/nc_optimisation.cmake b/nc_optimisation.cmake
index b2b097c..95a589a 100644
--- a/nc_optimisation.cmake
+++ b/nc_optimisation.cmake
@@ -26,11 +26,21 @@ if (LTO)
     # Add the linker flags first otherwise the linker may not recognise the
     # object format
     append_link_flag("-fuse-linker-plugin")
-    append_link_flag("-flto")
+    # HACK: we shouldn't use 'auto' as it will likely lead to oversubscription
+    #   but I'm sick of holding GCC's hand today.
+    append_first_link_flag("-flto=auto" "-flto")
 
     # Enable LTO on the compilation side, but try very hard to avoid
     # situations where we may accidentally use regular/fat objects.
-    append_compile_flag("-flto")
+    #
+    # GCC 12 will emit a warning about serial compilation of LTRANS jobs if an
+    #   explicit parameter is not passed. It must be an integer, auto, or
+    #   jobserver.
+    # Clang will only accept 'full', 'thin', or no argument.
+    #
+    # HACK: we shouldn't use 'auto' as it will likely lead to oversubscription
+    #   but I'm sick of holding GCC's hand today.
+    append_first_compile_flag("-flto=auto" "-flto")
     append_compile_flag("-fno-fat-lto-objects")
     append_compile_flag("-flto-jobs=0")