Linux: v5.11, make options, usable config

linux/recipe.spec

@@ -1,17 +1,20 @@
 name: linux
-version: 5.2.9
+version: 5.11
 sources:
 	- https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-%{version}.tar.xz
 	- config
 build-dependances:
 	- flex
 
+options:
+	# WARNING: this has to be the same environment variables used
+	#          during the creation of the config file
+	- make: -j5 CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar HOSTLD=ld.lld
+
 @configure
 	cd '%{name}-%{version}'
-
+	make mrproper
 	cp ../config .config
-	make olddefconfig
-
 
 @install
 	cd 'linux-%{version}'