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n-diff - Compare two putatively similar files, ignoring small numeric differences

Description:

When a numerical program is run in multiple environments (operating
systems, architectures, or compilers), assessing its consistency can
be a difficult task for a human, since small differences in numerical
output values are expected.

Application of a file differencing utility, such as POSIX/UNIX
diff(1), will generally produce voluminous output, often longer than
the original files, and is thus not useful.  The lesser-known UNIX
spiff(1) utility, while capable of handling numeric fields, suffers
from excessively-long running times, and often terminates prematurely.

n-diff provides a solution to this problem.  It compares two files that
are expected to be identical, or at least, numerically similar.  It
assumes that lines consist of whitespace-separated fields of numeric
and non-numeric data.

Packages

- Modernize spec
- Avoid configure removing -g -O2

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