Failure of sawfish to build with Fedora 11

[Allan Duncan <amd2345 fastmail com au>]

I have a curious failure to build sawfish on F11.  From the build log:
RPM build errors:
    File not found: 
/home/alland/rpmbuild/BUILDROOT/sawfish-1.5.0-1.i386/rep/i686-pc-linux-gnu/sawfish

which is quite true, the place where the files are at is:
/home/alland/rpmbuild/BUILDROOT/sawfish-1.5.0-1.i386/usr/lib/rep/i686-pc-linux-gnu/sawfish/

Same code on F10 works as advertised.  Suggestions welcome.
I have logs of the autogen.sh run and the rpm build if helpful.

There is also an error that has been around for a while that doesn't break
the  build:
main.c:41:19: error: build.h: No such file or directory

build.h is created _after_ it is used in main.c, but with the same
timestamp as main.o, so maybe there is a race between threads or
processes.