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Peter W. Draper authored
When moving from AC_OPENMP and AX_OPENMP we stopped AC_SUBST of OPENMP_CFLAGS and these haven't been used since. Fix that, but do that by only using the OPENMP_CFLAGS as needed, that is as compiler hints for vectorizing some loops in the gravity interactions and only requiring the OpenMP runtime when linking against an OpenMP FFTW library.
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