parallel make bug in tune/ directory

[Win C]

This is a bug of the current mercurial repo in the tune/ directory:

When I run `make -j6 allprogs` for the first time, an error was emitted:


libtool: link: (cd .libs/libspeed.lax/libtests.a && ar x "/data/data/com.termux/files/home/gmp-unstable/tune/../tests/.libs/libtests.a")

libtool:   error: cannot find the library 'libspeed.la' or unhandled argument 'libspeed.la'

make: *** [Makefile:626: tune-gcd-p] Error 1

The error will not be emitted when I invoke the above command for the second time. How to fix this? Thanks!