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Compilation on debian sid

From: D Haley
Subject: Compilation on debian sid
Date: Wed, 15 Jul 2020 10:50:40 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0

Dear GSL,

I recently needed to modify my code to include a definition for size_t,
via #include <cstddef> as this was not available on a Debian Sid
builder, when using gsl_spmatrix.h [1].

I believe more recent versions of GCC have been reducing the header
scope, as this builds on Debian stable and testing without any
difficulties. I have not spun up a sid image to be able to do test this
locally, as this occurred within a cowbuilder environment.

diff --git a/src/backend/filters/spatialAnalysis.cpp
index 2453cbe..91faebf 100644
--- a/src/backend/filters/spatialAnalysis.cpp
+++ b/src/backend/filters/spatialAnalysis.cpp
@@ -15,6 +15,10 @@
  *     You should have received a copy of the GNU General Public License
  *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//GSL_spmatrix seems to be missing size_t definition
+#include <cstddef>
 #include <gsl/gsl_sf_gamma.h>
 #include <gsl/gsl_spmatrix.h>


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