kylemcdonald / ofxCv

Alternative approach to interfacing with OpenCv from openFrameworks.
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issue compiling on linux #261

Closed cyrstem closed 4 years ago

cyrstem commented 5 years ago

hi im trying to compile example-background under linux and i get this error

make[1]: [/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworksCompiled/project/makefileCommon/compile.project.mk:217: obj/linux64/Release/src/ofApp.o] Error 1 make[1]: Leaving directory '/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background' make: [/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworksCompiled/project/makefileCommon/compile.project.mk:129: Release] Error 2


HOST_OS=Linux
checking pkg-config libraries:   cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal libcurl glfw3 rtaudio libpulse-simple alsa gl glu glew gtk+-3.0 libmpg123 
with PKG_CONFIG_LIBDIR=
Compiling OF library for Release
make[1]: Entering directory '/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworksCompiled/project'
HOST_OS=Linux
checking pkg-config libraries:   cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal libcurl glfw3 rtaudio libpulse-simple alsa gl glu glew gtk+-3.0 libmpg123 
with PKG_CONFIG_LIBDIR=
HOST_OS=Linux
checking pkg-config libraries:   cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal libcurl glfw3 rtaudio libpulse-simple alsa gl glu glew gtk+-3.0 libmpg123 
with PKG_CONFIG_LIBDIR=
HOST_OS=Linux
checking pkg-config libraries:   cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal libcurl glfw3 rtaudio libpulse-simple alsa gl glu glew gtk+-3.0 libmpg123 
with PKG_CONFIG_LIBDIR=
Done!
make[1]: Leaving directory '/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworksCompiled/project'

Compiling example-background for Release
make[1]: Entering directory '/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background'
HOST_OS=Linux
checking pkg-config libraries:   cairo zlib gstreamer-app-1.0 gstreamer-1.0 gstreamer-video-1.0 gstreamer-base-1.0 libudev freetype2 fontconfig sndfile openal libcurl glfw3 rtaudio libpulse-simple alsa gl glu glew gtk+-3.0 libmpg123 
with PKG_CONFIG_LIBDIR=
Compiling /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp
g++ -c -O3 -march=native -mtune=native -DNDEBUG -Wall -Werror=return-type -std=c++14 -DGCC_HAS_REGEX -DOF_USING_GTK -DOF_USING_GTK -DOF_USING_MPG123  -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/uuid -I/usr/include/gstreamer-1.0 -I/usr/include/orc-0.4 -I/usr/include/AL -I/usr/include/rtaudio -D_FORTIFY_SOURCE=2 -D__UNIX_JACK__ -D__LINUX_ALSA__ -D__LINUX_PULSE__ -I/usr/include/alsa -D_REENTRANT -I/usr/include/libdrm -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -pthread -I/usr/include/opencv4 -I/home/jacos/of_v20190324_linux64gcc6_release/libs/fmodex/include -I/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include -I/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm -I/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/gtc -I/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/detail -I/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/gtx -I/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/simd -I/home/jacos/of_v20190324_linux64gcc6_release/libs/json/include -I/home/jacos/of_v20190324_linux64gcc6_release/libs/kiss/include -I/home/jacos/of_v20190324_linux64gcc6_release/libs/pugixml/include -I/home/jacos/of_v20190324_linux64gcc6_release/libs/tess2/include -I/home/jacos/of_v20190324_linux64gcc6_release/libs/utf8/include -I/home/jacos/of_v20190324_linux64gcc6_release/libs/utf8/include/utf8 -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/communication -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/utils -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/3d -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/events -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/video -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/sound -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/gl -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/graphics -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/types -I/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/app -I/usr/include/cairo -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/libffi-3.2.1/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/uuid -I/usr/include/gstreamer-1.0 -I/usr/include/orc-0.4 -I/usr/include/AL -I/usr/include/rtaudio -D_FORTIFY_SOURCE=2 -D__UNIX_JACK__ -D__LINUX_ALSA__ -D__LINUX_PULSE__ -I/usr/include/alsa -D_REENTRANT -I/usr/include/libdrm -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -pthread -I/usr/include/opencv4 -I/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src -I/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/ofxCv/include -I/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/CLD/include/CLD -I/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/src -Isrc -I/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxGui/src -I/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxOpenCv/src -I/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxOpenCv/libs -MMD -MP -MF obj/linux64/Release/src/ofApp.d -MT obj/linux64/Release/src/ofApp.o -o obj/linux64/Release/src/ofApp.o -c /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.hpp:579,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/ext.hpp:48,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVectorMath.h:21,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:37,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl: In function ‘glm::vec2 glm::unpackUnorm2x8(glm::uint16)’:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl:377:37: warning: ‘void* memcpy(void*, const void*, size_t)’ copying an object of non-trivial type ‘glm::u8vec2’ {aka ‘struct glm::tvec2<unsigned char, (glm::precision)0>’} from an array of ‘glm::uint16’ {aka ‘short unsigned int’} [-Wclass-memaccess]
   memcpy(&Unpack, &p, sizeof(Unpack));
                                     ^
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/vec2.hpp:6,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/events/ofEvents.h:8,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/utils/ofURLFileLoader.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:11,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/detail/type_vec2.hpp:19:9: note: ‘glm::u8vec2’ {aka ‘struct glm::tvec2<unsigned char, (glm::precision)0>’} declared here
  struct tvec2
         ^~~~~
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.hpp:579,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/ext.hpp:48,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVectorMath.h:21,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:37,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl: In function ‘glm::vec2 glm::unpackSnorm2x8(glm::uint16)’:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl:409:37: warning: ‘void* memcpy(void*, const void*, size_t)’ copying an object of non-trivial type ‘glm::i8vec2’ {aka ‘struct glm::tvec2<signed char, (glm::precision)0>’} from an array of ‘glm::uint16’ {aka ‘short unsigned int’} [-Wclass-memaccess]
   memcpy(&Unpack, &p, sizeof(Unpack));
                                     ^
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/vec2.hpp:6,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/events/ofEvents.h:8,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/utils/ofURLFileLoader.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:11,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/detail/type_vec2.hpp:19:9: note: ‘glm::i8vec2’ {aka ‘struct glm::tvec2<signed char, (glm::precision)0>’} declared here
  struct tvec2
         ^~~~~
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.hpp:579,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/ext.hpp:48,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVectorMath.h:21,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:37,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl: In function ‘glm::vec4 glm::unpackUnorm4x16(glm::uint64)’:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl:437:37: warning: ‘void* memcpy(void*, const void*, size_t)’ copying an object of non-trivial type ‘glm::u16vec4’ {aka ‘struct glm::tvec4<short unsigned int, (glm::precision)0>’} from an array of ‘glm::uint64’ {aka ‘long unsigned int’} [-Wclass-memaccess]
   memcpy(&Unpack, &p, sizeof(Unpack));
                                     ^
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/vec4.hpp:6,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVec4f.h:8,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVec3f.h:5,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/types/ofPoint.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/types/ofParameter.h:5,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/utils/ofJson.h:4,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:21,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/detail/type_vec4.hpp:19:9: note: ‘glm::u16vec4’ {aka ‘struct glm::tvec4<short unsigned int, (glm::precision)0>’} declared here
  struct tvec4
         ^~~~~
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.hpp:579,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/ext.hpp:48,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVectorMath.h:21,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:37,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl: In function ‘glm::vec4 glm::unpackSnorm4x16(glm::uint64)’:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl:469:37: warning: ‘void* memcpy(void*, const void*, size_t)’ copying an object of non-trivial type ‘glm::i16vec4’ {aka ‘struct glm::tvec4<short int, (glm::precision)0>’} from an array of ‘glm::uint64’ {aka ‘long unsigned int’} [-Wclass-memaccess]
   memcpy(&Unpack, &p, sizeof(Unpack));
                                     ^
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/vec4.hpp:6,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVec4f.h:8,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVec3f.h:5,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/types/ofPoint.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/types/ofParameter.h:5,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/utils/ofJson.h:4,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:21,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/detail/type_vec4.hpp:19:9: note: ‘glm::i16vec4’ {aka ‘struct glm::tvec4<short int, (glm::precision)0>’} declared here
  struct tvec4
         ^~~~~
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.hpp:579,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/ext.hpp:48,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVectorMath.h:21,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:37,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl: In function ‘glm::vec4 glm::unpackHalf4x16(glm::uint64)’:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/./gtc/packing.inl:505:37: warning: ‘void* memcpy(void*, const void*, size_t)’ copying an object of non-trivial type ‘glm::i16vec4’ {aka ‘struct glm::tvec4<short int, (glm::precision)0>’} from an array of ‘glm::uint64’ {aka ‘long unsigned int’} [-Wclass-memaccess]
   memcpy(&Unpack, &v, sizeof(Unpack));
                                     ^
In file included from /home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/vec4.hpp:6,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVec4f.h:8,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/math/ofVec3f.h:5,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/types/ofPoint.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/types/ofParameter.h:5,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/utils/ofJson.h:4,
                 from /home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworks/ofMain.h:21,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:3,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/libs/glm/include/glm/detail/type_vec4.hpp:19:9: note: ‘glm::i16vec4’ {aka ‘struct glm::tvec4<short int, (glm::precision)0>’} declared here
  struct tvec4
         ^~~~~
In file included from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/src/ofxCv.h:10,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:4,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/ofxCv/include/ofxCv/Wrappers.h: In function ‘void ofxCv::copyGray(const S&, D&)’:
/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/ofxCv/include/ofxCv/Wrappers.h:194:36: error: ‘CV_RGBA2GRAY’ was not declared in this scope
             convertColor(src, dst, CV_RGBA2GRAY);
                                    ^~~~~~~~~~~~
/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/ofxCv/include/ofxCv/Wrappers.h:194:36: note: suggested alternative: ‘GL_RGBA2_EXT’
             convertColor(src, dst, CV_RGBA2GRAY);
                                    ^~~~~~~~~~~~
                                    GL_RGBA2_EXT
/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/ofxCv/include/ofxCv/Wrappers.h:196:36: error: ‘CV_RGB2GRAY’ was not declared in this scope
             convertColor(src, dst, CV_RGB2GRAY);
                                    ^~~~~~~~~~~
/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/ofxCv/include/ofxCv/Wrappers.h:196:36: note: suggested alternative: ‘CV_RGB’
             convertColor(src, dst, CV_RGB2GRAY);
                                    ^~~~~~~~~~~
                                    CV_RGB
In file included from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/src/ofxCv.h:23,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.h:4,
                 from /home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background/src/ofApp.cpp:1:
/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/ofxCv/include/ofxCv/Tracker.h: In member function ‘virtual const std::vector<unsigned int>& ofxCv::RectTracker::track(const std::vector<cv::Rect_<int> >&)’:
/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/libs/ofxCv/include/ofxCv/Tracker.h:326:21: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<unsigned int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
    for(int i = 0; i < labels.size(); i++) {
                   ~~^~~~~~~~~~~~~~~
make[1]: *** [/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworksCompiled/project/makefileCommon/compile.project.mk:217: obj/linux64/Release/src/ofApp.o] Error 1
make[1]: Leaving directory '/home/jacos/of_v20190324_linux64gcc6_release/addons/ofxCv/example-background'
make: *** [/home/jacos/of_v20190324_linux64gcc6_release/libs/openFrameworksCompiled/project/makefileCommon/compile.project.mk:129: Release] Error 2