If you try and use e.g. kernel_obsoletes, you'll soon find
that it's actually kernel__obsoletes you currently need :-)

Index: devel/kernel.spec
===================================================================
--- devel.orig/kernel.spec	2008-07-23 14:04:17.000000000 +0100
+++ devel.orig/kernel.spec	2008-07-23 14:04:17.000000000 +0100
@@ -440,9 +440,9 @@ Provides: kernel-uname-r = %{KVERREL}%{?
 Requires(pre): %{kernel_prereq}\
 Conflicts: %{kernel_dot_org_conflicts}\
 Conflicts: %{package_conflicts}\
-%{?1:%{expand:%%{?kernel_%{1}_conflicts:Conflicts: %%{kernel_%{1}_conflicts}}}}\
-%{?1:%{expand:%%{?kernel_%{1}_obsoletes:Obsoletes: %%{kernel_%{1}_obsoletes}}}}\
-%{?1:%{expand:%%{?kernel_%{1}_provides:Provides: %%{kernel_%{1}_provides}}}}\
+%{?1:%{expand:%%{?kernel%{?1:_%{1}}_conflicts:Conflicts: %%{kernel%{?1:_%{1}}_conflicts}}}}\
+%{?1:%{expand:%%{?kernel%{?1:_%{1}}_obsoletes:Obsoletes: %%{kernel%{?1:_%{1}}_obsoletes}}}}\
+%{?1:%{expand:%%{?kernel%{?1:_%{1}}_provides:Provides: %%{kernel%{?1:_%{1}}_provides}}}}\
 # We can't let RPM do the dependencies automatic because it'll then pick up\
 # a correct but undesirable perl dependency from the module headers which\
 # isn't required for the kernel proper to function\

-- 


