Aha. The build failure was caused by
https://trac.sagemath.org/ticket/27444 , exactly as embray's
comment:34 suggested. Undoing the 1-line change from that branch to
build/pkgs/fflas_ffpack/spkg-install and recompiling fflas_ffpack
(sage -f fflas_ffpack) got me through that point. Hope the rest of the
build goes smoothly... --Darij

On Fri, Jan 3, 2020 at 5:13 PM Darij Grinberg <darijgrinb...@gmail.com> wrote:
>
> From the end of install.log:
>
> build/temp.cygwin-3.0.7-x86_64-3.7/build/cythonized/sage/matrix/matrix_modn_sparse.o:
>  In function `FFPACK::rns_double::reduce(unsigned long, double*, unsigned 
> long, bool) const':
> [sagelib-9.0] 
> /home/skraeling/sage/local/include/fflas-ffpack/field/rns-double.inl:530: 
> undefined reference to `omp_get_num_threads'
> [sagelib-9.0] 
> /home/skraeling/sage/local/include/fflas-ffpack/field/rns-double.inl:533: 
> undefined reference to `GOMP_parallel'
> [sagelib-9.0] 
> build/temp.cygwin-3.0.7-x86_64-3.7/build/cythonized/sage/matrix/matrix_modn_sparse.o:
>  In function `FFPACK::rns_double::init(unsigned long, unsigned long, double*, 
> unsigned long, Givaro::Integer const*, unsigned long, unsigned long, bool) 
> const':
> [sagelib-9.0] 
> /home/skraeling/sage/local/include/fflas-ffpack/paladin/blockcuts.inl:67: 
> undefined reference to `omp_get_num_threads'
> [sagelib-9.0] collect2: error: ld returned 1 exit status
> [sagelib-9.0] error: command 'g++' failed with exit status 1
> [sagelib-9.0] make[4]: *** [Makefile:33: sage] Error 1
> [sagelib-9.0] make[4]: Leaving directory '/home/skraeling/sage/src'
>
> This happens reproducibly both with "make" and with "make install", after the 
> sagelib modules compile. There are further "undefined reference" messages all 
> the way during the sagelib compilation process.
>
> Any ideas?
>
> Best regards & happy almost-new year,
> Darij
>
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