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.

--- libmng-2.0.2/Makefile.am.orig	2013-10-18 22:28:44 -0400
+++ libmng-2.0.2/Makefile.am	2013-10-18 22:27:11 -0400
@@ -8,7 +8,7 @@
 
 
 # libmng release @VERSION@
-libmng_la_LDFLAGS = \
+libmng_la_LDFLAGS = -no-undefined \
 	-version-number @MNG_MAJOR_NR@:@MNG_MINOR_NR@:@MNG_RELEASE_NR@
 
 lib_LTLIBRARIES = libmng.la