K 10
svn:author
V 6
pkubaj
K 8
svn:date
V 27
2019-10-08T17:12:47.736274Z
K 7
svn:log
V 213
math/gretl: fix build on GCC architectures

Don't unconditionally use libomp, it breaks build on GCC architectures.

Instead set USES=compiler:openmp.

PR:		241099
Approved by:	yuri (maintainer), linimon (mentor)

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