Update docs for FLINT + minor configuration changes #239
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Also add workaround OPENBLAS_NUM_THREADS=1 to Usage.md Sometimes openblas_set_num_threads(1) does not work, and one has to set environment variables export OPENBLAS_NUM_THREADS=1 and/or export OMP_NUM_THREADS=1
See also #238 Compilation errors when using FLINT 2.7.1 There were many changes between 2.7 and 2.8, and it's hard to support 2.7.
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Close Compilation errors when using FLINT 2.7.1 #238, won't fix it.
For some reason,
openblas_set_num_threads(1)does not always work. In that case, one has to set environment variablesOPENBLAS_NUM_THREADS=1and/orOMP_NUM_THREADS=1.openblas_set_num_threads(1)only when OpenBLAS is detected.Otherwise, compilation fails for other BLAS implementations (e.g. FlexiBLAS)