This is, at best, a work-around for an issue that presents when
earlier versions of Autoconf (e.g., 2.59) are used to process Dune's
DUNE_BOOST_BASE macro (introduced in dune-common@6480,
dune-istl@1492). For reasons I've been unable to determine, the
HAVE_BOOST symbol just gets #define-d, not set to `ENABLE_BOOST' as
was intended. Some kind of race condition?
Anyway, the Dune ISTL module uses statements such as
#if HAVE_BOOST
/* ... */
#endif
to determine if particular software features should be enabled.
This breaks down if `HAVE_BOOST' is simply defined. Following
commit fb614100, the symbol `OPM_HAVE_BOOST' is always defined (as a
Boolean state), so if we override ISTL's notion of `HAVE_BOOST', the
above construction continues to work.
We will, however, happily remove thise kluge if a better solution
arises in the core Dune modules.
82369f9109