>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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