Arch Linux Kernel 3.0 configure error

[key]

Error Info
auto/os/linux: line 21: 3.0-ARCH: syntax error: invalid arithmetic
operator (error token is ".0-ARCH")

version=$((`uname -r \
       | sed
's/^\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1*256*256+\2*256+\3/'`))

ArchLinux Linux Kernel 3.0

[root at doneta nginx-1.0.5]# uname -r
3.0-ARCH

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,213820,213820#msg-213820