[build] be more verbose on kvm not working

diff --git a/build b/build
index cb4aeb8..5afaf98 100755 (executable)
--- a/build
+++ b/build
@@ -1040,6 +1040,7 @@ fi
 if [ "$VM_TYPE" = 'kvm' -a -z "$RUNNING_IN_VM" ]; then
     if [ ! -r /dev/kvm -o ! -x "$qemu_bin"-kvm ]; then
        echo "host doesn't support kvm"
+       echo "either the kvm kernel-module is not loaded or kvm is not installed or hardware virtualization is deactivated in the BIOS."
        cleanup_and_exit 3
     fi
     qemu_bin="$kvm_bin"