--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/maintainers_add_the_linux_kbuilddir_finder.patch	Sun Jan 15 21:36:15 2012 +0100
@@ -0,0 +1,88 @@
+# HG changeset patch
+# Parent 6682d6e4330ef0429c41af6dcbe0362ff15d9841
+maintainers: add a CMake finder for the Linux build tree and only build the e1000 sample if it is found
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -29,12 +29,17 @@
+ 
+ FIND_PACKAGE(LATEX)
+ FIND_PACKAGE(CodeWorker REQUIRED)
++FIND_PACKAGE(LinuxKBuildDir)
+ 
+ INCLUDE(AddFileDependencies)
+ INCLUDE(FileCopy)
+ INCLUDE(RathaxesCopyLatexClasses)
+ INCLUDE(UseRathaxes)
+ 
++IF (CMAKE_SYSTEM_NAME MATCHES "Linux" AND NOT LINUX_KBUILD_DIR)
++    MESSAGE(STATUS "No valid Linux build tree found, kernel modules will not be built")
++ENDIF (CMAKE_SYSTEM_NAME MATCHES "Linux" AND NOT LINUX_KBUILD_DIR)
++
+ # Global definitions ###########################################################
+ 
+ ENABLE_TESTING()
+diff --git a/maintainers/CMakeScripts/FindLinuxKBuildDir.cmake b/maintainers/CMakeScripts/FindLinuxKBuildDir.cmake
+new file mode 100644
+--- /dev/null
++++ b/maintainers/CMakeScripts/FindLinuxKBuildDir.cmake
+@@ -0,0 +1,41 @@
++# Check if the kernel build directory exists
++#
++# This finder will seek for the usual /lib/modules/`uname -r`/build/
++# directory. Obviously, this is Linux specific.
++#
++# You can specify an alternate build directory by using the environment
++# variable LINUX_KBUILD_DIR.
++#
++# This is necessary to build Linux kernel modules!
++#
++# Usage: FIND_PACKAGE(LinuxKBuildDir [REQUIRED])
++#
++# This will set the variable LINUX_KBUILD_DIR with the path to the KBuild
++# directory, if it is found.
++
++IF (NOT LINUX_KBUILD_DIR)
++    IF ($ENV{LINUX_KBUILD_DIR})
++        SET(KDIR $ENV{LINUX_KBUILD_DIR})
++    ELSE ($ENV{LINUX_KBUILD_DIR})
++        SET(KDIR "/lib/modules/${CMAKE_SYSTEM_VERSION}/build/")
++    ENDIF ($ENV{LINUX_KBUILD_DIR})
++
++    IF (IS_DIRECTORY "${KDIR}")
++        FIND_FILE(LINUX_KBUILD_DIR_MAKEFILE "Makefile"
++                  PATHS "${KDIR}"
++                  # Restrict the search to this directory only:
++                  NO_DEFAULT_PATH
++                  NO_CMAKE_ENVIRONMENT_PATH
++                  NO_CMAKE_PATH
++                  NO_SYSTEM_ENVIRONMENT_PATH
++                  NO_CMAKE_SYSTEM_PATH)
++        # Check if it looks legit:
++        IF (LINUX_KBUILD_DIR_MAKEFILE)
++            SET(LINUX_KBUILD_DIR "${KDIR}" CACHE PATH "Path to the Linux KBuild directory (usually /lib/modules/`uname -r`/build/)")
++        ENDIF (LINUX_KBUILD_DIR_MAKEFILE)
++    ENDIF (IS_DIRECTORY "${KDIR}")
++ENDIF (NOT LINUX_KBUILD_DIR)
++
++INCLUDE(FindPackageHandleStandardArgs)
++
++FIND_PACKAGE_HANDLE_STANDARD_ARGS(LinuxKBuildDir DEFAULT_MSG LINUX_KBUILD_DIR)
+diff --git a/rathaxes/samples/e1000/CMakeLists.txt b/rathaxes/samples/e1000/CMakeLists.txt
+--- a/rathaxes/samples/e1000/CMakeLists.txt
++++ b/rathaxes/samples/e1000/CMakeLists.txt
+@@ -2,10 +2,6 @@
+                      RTI log.rti lkm.rti pci.rti socket.rti ethernet.rti e1000.rti
+                      BLT log.blt lkm.blt pci.blt socket.blt ethernet.blt e1000.blt)
+ 
+-# We can't name lkm since it's already used as the target name to generate the
+-# source (with ADD_RATHAXES_SOURCES).
+-
+-# does not work atm
+-IF (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+-	ADD_RATHAXES_LKM(e1000 e1000_src)
+-ENDIF (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
++IF (LINUX_KBUILD_DIR)
++    ADD_RATHAXES_LKM(e1000 e1000_src)
++ENDIF (LINUX_KBUILD_DIR)