From d81440c8ab0661710756f8f62769f2609a586c03 Mon Sep 17 00:00:00 2001
From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Wed, 14 Jul 2010 12:37:31 -0700
Subject: [PATCH 1/2] Check sourcelink is set before passing to readlink

When no source was found in any of the expected paths treat
this as fatal and provide the user with a hint as to what
they should do.
---
 config/kernel.m4 | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/config/kernel.m4 b/config/kernel.m4
index 4cea344ccd..9bf63d4272 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -84,13 +84,14 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 			             2>/dev/null | grep -v obj | tail -1)
 		fi
 
-		if test -e $sourcelink; then
+		if test -n "$sourcelink" && test -e ${sourcelink}; then
 			kernelsrc=`readlink -f ${sourcelink}`
 		else
 			AC_MSG_RESULT([Not found])
 			AC_MSG_ERROR([
-			*** Please specify the location of the kernel source
-			*** with the '--with-linux=PATH' option])
+	*** Please make sure the kernel devel package for your distribution
+	*** is installed then try again.  If that fails you can specify the
+	*** location of the kernel source with the '--with-linux=PATH' option.])
 		fi
 	else
 		if test "$kernelsrc" = "NONE"; then
@@ -206,8 +207,9 @@ AC_DEFUN([ZFS_AC_SPL], [
 		else
 			AC_MSG_RESULT([Not found])
 			AC_MSG_ERROR([
-			*** Please specify the location of the spl source
-			*** with the '--with-spl=PATH' option])
+	*** Please make sure the spl devel package for your distribution
+	*** is installed then try again.  If that fails you can specify the
+	*** location of the spl source with the '--with-spl=PATH' option.])
 		fi
 	else
 		if test "$splsrc" = "NONE"; then

From 548c9c6829bd01b4db50c739ba5b8d8b4081f033 Mon Sep 17 00:00:00 2001
From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Wed, 14 Jul 2010 12:40:36 -0700
Subject: [PATCH 2/2] Use $target_cpu instead of `arch`

We should not be using arch for a few reasons.  First off it might
not be installed on their system, and secondly they may be trying
to cross-compile.
---
 config/kernel.m4 | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/config/kernel.m4 b/config/kernel.m4
index 9bf63d4272..ca61dfd174 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -102,12 +102,12 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 	AC_MSG_RESULT([$kernelsrc])
 	AC_MSG_CHECKING([kernel build directory])
 	if test -z "$kernelbuild"; then
-		if test -d ${kernelsrc}-obj/`arch`/`arch`; then
-			kernelbuild=${kernelsrc}-obj/`arch`/`arch`
-		elif test -d ${kernelsrc}-obj/`arch`/default; then
-		        kernelbuild=${kernelsrc}-obj/`arch`/default
-		elif test -d `dirname ${kernelsrc}`/build-`arch`; then
-			kernelbuild=`dirname ${kernelsrc}`/build-`arch`
+		if test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
+			kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
+		elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
+		        kernelbuild=${kernelsrc}-obj/${target_cpu}/default
+		elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
+			kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 		else
 			kernelbuild=${kernelsrc}
 		fi