Fail to Inferenceoverlay on Ubuntu 16.04

[bill9889]

Inferenceoverlay fails to build on Ubuntu 16.04 following the wiki instructions link

Seems Inferenceoverlay requires opencv 3.3.1 or later, but Ubuntu 16.04 has opencv 2.4.9.1 available.

Making all in opencv
make[4]: Entering directory '/home/aphillips/work/customers/EDGEMATRIX/TF/gst-inference/gst-libs/gst/opencv'
/bin/sh ../../../libtool  --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H -I. -I../../..    -I../../../gst-libs -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -DGST_USE_UNSTABLE_API -Wno-error=missing-include-dirs  -DG_THREADS_MANDATORY -DG_DISABLE_DEPRECATED -Wall -Wdeclaration-after-statement -Wvla -Wpointer-arith -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wwrite-strings -Wold-style-definition -Waggregate-return -Winit-self -Wmissing-include-dirs -Waddress -Wno-multichar -Wnested-externs -Werror  -g   -DGST_DISABLE_DEPRECATED -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/r2inference-0.0/  -MT libgstinferencebaseoverlay_1.0_la-gstinferencebaseoverlay.lo -MD -MP -MF .deps/libgstinferencebaseoverlay_1.0_la-gstinferencebaseoverlay.Tpo -c -o libgstinferencebaseoverlay_1.0_la-gstinferencebaseoverlay.lo `test -f 'gstinferencebaseoverlay.cc' || echo './'`gstinferencebaseoverlay.cc
libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I../../.. -I../../../gst-libs -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -DGST_USE_UNSTABLE_API -Wno-error=missing-include-dirs -DG_THREADS_MANDATORY -DG_DISABLE_DEPRECATED -Wall -Wdeclaration-after-statement -Wvla -Wpointer-arith -Wmissing-declarations -Wmissing-prototypes -Wredundant-decls -Wwrite-strings -Wold-style-definition -Waggregate-return -Winit-self -Wmissing-include-dirs -Waddress -Wno-multichar -Wnested-externs -Werror -g -DGST_DISABLE_DEPRECATED -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -pthread -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/r2inference-0.0/ -MT libgstinferencebaseoverlay_1.0_la-gstinferencebaseoverlay.lo -MD -MP -MF .deps/libgstinferencebaseoverlay_1.0_la-gstinferencebaseoverlay.Tpo -c gstinferencebaseoverlay.cc  -fPIC -DPIC -o .libs/libgstinferencebaseoverlay_1.0_la-gstinferencebaseoverlay.o
cc1plus: warning: command line option ‘-Wdeclaration-after-statement’ is valid for C/ObjC but not for C++
cc1plus: warning: command line option ‘-Wmissing-prototypes’ is valid for C/ObjC but not for C++
cc1plus: warning: command line option ‘-Wold-style-definition’ is valid for C/ObjC but not for C++
cc1plus: warning: command line option ‘-Wnested-externs’ is valid for C/ObjC but not for C++
In file included from gstinferencebaseoverlay.cc:22:0:
gstinferencebaseoverlay.h:30:31: fatal error: opencv2/imgproc.hpp: No such file or directory
compilation terminated.
Makefile:606: recipe for target 'libgstinferencebaseoverlay_1.0_la-gstinferencebaseoverlay.lo' failed
make[4]: *** [libgstinferencebaseoverlay_1.0_la-gstinferencebaseoverlay.lo] Error 1
make[4]: Leaving directory '/home/aphillips/work/customers/EDGEMATRIX/TF/gst-inference/gst-libs/gst/opencv'
Makefile:500: recipe for target 'all-recursive' failed
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory '/home/aphillips/work/customers/EDGEMATRIX/TF/gst-inference/gst-libs/gst'
Makefile:490: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/home/aphillips/work/customers/EDGEMATRIX/TF/gst-inference/gst-libs'
Makefile:627: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/aphillips/work/customers/EDGEMATRIX/TF/gst-inference'
Makefile:535: recipe for target 'all' failed

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