--- ati-drivers-9.8.ebuild.orig	2009-08-29 18:06:53.000000000 +0200
+++ ati-drivers-9.8.ebuild	2009-08-31 09:15:29.000000000 +0200
@@ -125,10 +125,24 @@
 		eerror "    Bus options (PCI etc.)  --->"
 		eerror "        [*] Message Signaled Interrupts (MSI and MSI-X)"
 		eerror "in the kernel config."
 		die "CONFIG_PCI_MSI disabled"
 	fi
+
+	if linux_chkconfig_present LOCKDEP; then
+		eerror "You've enabled LOCKDEP -- lock tracking -- in the kernel."
+		eerror "Unfortunately, this option exports the symbol lock_acquire as GPL-only."
+		eerror "This prevents ${P} from compiling with an error like this:"
+		eerror "FATAL: modpost: GPL-incompatible module fglrx.ko uses GPL-only symbol 'lock_acquire'"
+		eerror "Please make sure the following options have been unset:"
+		eerror "    Kernel hacking  --->"
+		eerror "        [ ] Lock debugging: detect incorrect freeing of live locks"
+		eerror "        [ ] Lock debugging: prove locking correctness"
+		eerror "        [ ] Lock usage statistics"
+		eerror "in 'menuconfig'"
+		die "LOCKDEP enabled"
+	fi
 }
 
 pkg_setup() {
 	# Define module dir.
 	MODULE_DIR="${S}/common/lib/modules/fglrx/build_mod"