jdk8 build failure on xubuntu 13.04 32 bit: make: the `-j' option requires a positive integral argument

[Weijun Wang]

I just installed a Xubuntu 13.04 32 bit machine. Using 7u21 b13 as boot 
jdk, "bash configure" prompted me to install several packages but 
running make shows:

-----START-----
Building Java(TM) for target 'default' in configuration 
'linux-x86-normal-server-release'

## Starting langtools
make: the `-j' option requires a positive integral argument
...
This program built for i686-pc-linux-gnu
Report bugs to <bug-make at gnu.org>
make: *** [langtools-only] Error 2
-----END-----

What's wrong here?

Thanks
Max