Add build rule for build-octave (bug #49503). * src/build-octave.mk: Add new build rule for build-octave which can be used for cross-building binary packages that depend on Octave as a build tool. * dist-files.mk: Add new file to list. * index.html: Add new package to list. * src/of-communications.mk, src/of-image.mk, src/of-mapping.mk, src/of-optiminterp.mk, src/of-sparsersb.mk, src/of-statistics.mk, src/of-windows.mk: Add optional dependency on build-octave. * configure.ac: Add new configure switch "--disable-system-octave" that is needed to build the build-octave package. * Makefile.in: Add variable "USE_SYSTEM_OCTAVE". Exclude build-octave from the default build tools and build it only if a package explicitly depends on it. Display warning about missing native Octave version only if necessary.

From: Boris Pek
Date: Thu, 05 May 2016 15:38:47 +0300
Subject: [PATCH] fix build with GCC >= 6.x

diff --git a/ofstd/libsrc/ofstd.cc b/ofstd/libsrc/ofstd.cc
--- a/ofstd/libsrc/ofstd.cc
+++ b/ofstd/libsrc/ofstd.cc
@@ -175,7 +175,7 @@
 
 
 // some systems don't properly define isnan()
-#ifdef HAVE_ISNAN
+#if defined(HAVE_ISNAN) && (__cplusplus < 201103L)
 #ifndef HAVE_PROTOTYPE_ISNAN
 extern "C"
 {