clisp build failure on arm

[Will Newton <will@gbdirect.co.uk>]

The clisp package fails to build on arm with this error:

In file included from /usr/include/sys/procfs.h:34,
                 from /usr/include/sys/ucontext.h:26,
                 from /usr/include/ucontext.h:27,
                 from /usr/include/sigsegv.h:21,
                 from lispbibl.d:1794,
                 from spvw.d:22:
/usr/include/sys/user.h:31: error: syntax error before "void"
/usr/include/sys/user.h:32: error: syntax error before ':' token
/usr/include/sys/user.h:33: error: syntax error before ':' token
/usr/include/sys/user.h:34: error: syntax error before ':' token
/usr/include/sys/user.h:35: error: syntax error before ':' token
/usr/include/sys/user.h:36: error: syntax error before ':' token
/usr/include/sys/user.h:38: error: syntax error before ':' token
/usr/include/sys/user.h:39: error: syntax error before ':' token
/usr/include/sys/user.h:42: error: syntax error before '}' token
/usr/include/sys/user.h:68: error: field `u_fp' has incomplete type
In file included from /usr/include/ucontext.h:27,
                 from /usr/include/sigsegv.h:21,
                 from lispbibl.d:1794,
                 from spvw.d:22:
/usr/include/sys/ucontext.h:80: error: field `fpregs' has incomplete type

Full log:

http://buildd.debian.org/fetch.php?&pkg=clisp&ver=1%3A2.32-3&arch=arm&stamp=1073496017&file=log&as=raw

Can anyone diagnose the problem?

Thanks,