Octave Forge packages listed below cannot be installed on Tumbleweed 20180726
due to dependency requirement of liboctave.so.4 (installed version is
liboctave.so.5):

octave-forge-communications
octave-forge-fl-core
octave-forge-image
octave-forge-linear-algebra
octave-forge-mechanics
octave-forge-vrml

Manual installation with Octave's pkg fails:

>> pkg install -forge linear-algebra
conftest.cc:1:10: fatal error: octave/config.h: No such file or directory
 #include <octave/config.h>
          ^~~~~~~~~~~~~~~~~
compilation terminated.
configure: error: Could not run /usr/bin/mkoctfile-4.4.0
configure: loading site script /usr/share/site/x86_64-unknown-linux-gnu
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for mkoctfile... /usr/bin/mkoctfile-4.4.0

pkg: error running the configure script for linear-algebra.
error: called from
    configure_make at line 78 column 9
    install at line 184 column 7
    pkg at line 437 column 9