Opencv_contrib: Opencv3.2 freetype module build failed in macOS10.12

Created on 26 Dec 2016 · 16Comments · Source: opencv/opencv_contrib

OpenCV => 3.2
Operating System / Platform => macOS10.12
Compiler => XCode8.2
freetype version => 2.7

Undefined symbols for architecture x86_64:
  "_FT_Done_Face", referenced from:
      cv::freetype::FreeType2Impl::~FreeType2Impl() in freetype.o
      cv::freetype::FreeType2Impl::loadFontData(cv::String, int) in freetype.o
  "_FT_Done_FreeType", referenced from:
      cv::freetype::FreeType2Impl::~FreeType2Impl() in freetype.o
  "_FT_Init_FreeType", referenced from:
      cv::freetype::FreeType2Impl::FreeType2Impl() in freetype.o
      cv::freetype::FreeType2Impl::FreeType2Impl() in freetype.o
      cv::freetype::createFreeType2() in freetype.o
  "_FT_Load_Glyph", referenced from:
      cv::freetype::FreeType2Impl::putTextBitmapBlend(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextBitmapMono(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_FT_New_Face", referenced from:
      cv::freetype::FreeType2Impl::loadFontData(cv::String, int) in freetype.o
  "_FT_Outline_Decompose", referenced from:
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_FT_Outline_Transform", referenced from:
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_FT_Outline_Translate", referenced from:
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_FT_Render_Glyph", referenced from:
      cv::freetype::FreeType2Impl::putTextBitmapBlend(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextBitmapMono(cv::_InputOutputArray const&) in freetype.o
  "_FT_Set_Pixel_Sizes", referenced from:
      cv::freetype::FreeType2Impl::putText(cv::_InputOutputArray const&, cv::String const&, cv::Point_<int>, int, cv::Scalar_<double>, int, int, bool) in freetype.o
  "_hb_buffer_add_utf8", referenced from:
      cv::freetype::FreeType2Impl::putTextBitmapBlend(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextBitmapMono(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_hb_buffer_create", referenced from:
      cv::freetype::FreeType2Impl::putTextBitmapBlend(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextBitmapMono(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_hb_buffer_destroy", referenced from:
      cv::freetype::FreeType2Impl::putTextBitmapBlend(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextBitmapMono(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_hb_buffer_get_glyph_infos", referenced from:
      cv::freetype::FreeType2Impl::putTextBitmapBlend(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextBitmapMono(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_hb_buffer_guess_segment_properties", referenced from:
      cv::freetype::FreeType2Impl::putTextBitmapBlend(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextBitmapMono(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
  "_hb_font_destroy", referenced from:
      cv::freetype::FreeType2Impl::~FreeType2Impl() in freetype.o
      cv::freetype::FreeType2Impl::loadFontData(cv::String, int) in freetype.o
  "_hb_ft_font_create", referenced from:
      cv::freetype::FreeType2Impl::loadFontData(cv::String, int) in freetype.o
  "_hb_shape", referenced from:
      cv::freetype::FreeType2Impl::putTextBitmapBlend(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextBitmapMono(cv::_InputOutputArray const&) in freetype.o
      cv::freetype::FreeType2Impl::putTextOutline(cv::_InputOutputArray const&) in freetype.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

builinstall incomplete

Source

logic1988

Most helpful comment

on line 22 of opencv-freetype CMakefile, change ${freetype2_LIBRARIES} ${harfbuzz_LIBRARIES} to ${FREETYPE_LIBRARIES} ${HARFBUZZ_LIBRARIES}

mikeseven on 29 Dec 2016

👍19 🎉4

All 16 comments

What freetype/hardbuzz version do you have?
Please dump related lines from CMakeCache.txt file (something like grep -E 'FREETYPE|HARFBUZZ' CMakeCache.txt).

alalek on 26 Dec 2016

  128: //Include opencv_freetype module into the OpenCV build
  129: BUILD_opencv_freetype:BOOL=OFF
 1215: opencv_freetype_BINARY_DIR:STATIC=/Users/logic/Desktop/opencv_contrib/build/modules/freetype
 1218: opencv_freetype_LIB_DEPENDS:STATIC=general;opencv_core;general;opencv_imgproc;general;ippicv;general;-framework Accelerate;
 1221: opencv_freetype_SOURCE_DIR:STATIC=/Users/logic/Desktop/opencv_contrib/modules/freetype
 2193: FREETYPE_CFLAGS:INTERNAL=-I/usr/local/opt/freetype/include/freetype2
 2194: FREETYPE_CFLAGS_I:INTERNAL=
 2195: FREETYPE_CFLAGS_OTHER:INTERNAL=
 2196: FREETYPE_FOUND:INTERNAL=1
 2197: FREETYPE_INCLUDEDIR:INTERNAL=/usr/local/opt/freetype/include
 2198: FREETYPE_INCLUDE_DIRS:INTERNAL=/usr/local/opt/freetype/include/freetype2
 2199: FREETYPE_LDFLAGS:INTERNAL=-L/usr/local/opt/freetype/lib;-lfreetype
 2200: FREETYPE_LDFLAGS_OTHER:INTERNAL=
 2201: FREETYPE_LIBDIR:INTERNAL=/usr/local/opt/freetype/lib
 2202: FREETYPE_LIBRARIES:INTERNAL=freetype
 2203: FREETYPE_LIBRARY_DIRS:INTERNAL=/usr/local/opt/freetype/lib
 2204: FREETYPE_LIBS:INTERNAL=
 2205: FREETYPE_LIBS_L:INTERNAL=
 2206: FREETYPE_LIBS_OTHER:INTERNAL=
 2207: FREETYPE_LIBS_PATHS:INTERNAL=
 2208: FREETYPE_PREFIX:INTERNAL=/usr/local/opt/freetype
 2209: FREETYPE_STATIC_CFLAGS:INTERNAL=-I/usr/local/opt/freetype/include/freetype2
 2210: FREETYPE_STATIC_CFLAGS_I:INTERNAL=
 2211: FREETYPE_STATIC_CFLAGS_OTHER:INTERNAL=
 2212: FREETYPE_STATIC_INCLUDE_DIRS:INTERNAL=/usr/local/opt/freetype/include/freetype2
 2213: FREETYPE_STATIC_LDFLAGS:INTERNAL=-L/usr/local/opt/freetype/lib;-L/usr/local/Cellar/libpng/1.6.25/lib;-lfreetype;-lz;-lbz2;-lpng16;-lz
 2214: FREETYPE_STATIC_LDFLAGS_OTHER:INTERNAL=
 2215: FREETYPE_STATIC_LIBDIR:INTERNAL=
 2216: FREETYPE_STATIC_LIBRARIES:INTERNAL=freetype;z;bz2;png16;z
 2217: FREETYPE_STATIC_LIBRARY_DIRS:INTERNAL=/usr/local/opt/freetype/lib;/usr/local/Cellar/libpng/1.6.25/lib
 2218: FREETYPE_STATIC_LIBS:INTERNAL=
 2219: FREETYPE_STATIC_LIBS_L:INTERNAL=
 2220: FREETYPE_STATIC_LIBS_OTHER:INTERNAL=
 2221: FREETYPE_STATIC_LIBS_PATHS:INTERNAL=
 2222: FREETYPE_VERSION:INTERNAL=18.6.12
 2223: FREETYPE_freetype2_INCLUDEDIR:INTERNAL=
 2224: FREETYPE_freetype2_LIBDIR:INTERNAL=
 2225: FREETYPE_freetype2_PREFIX:INTERNAL=
 2226: FREETYPE_freetype2_VERSION:INTERNAL=
 2229: HARFBUZZ_CFLAGS:INTERNAL=-I/usr/local/Cellar/harfbuzz/1.3.3_1/include/harfbuzz;-I/usr/local/Cellar/glib/2.50.2/include/glib-2.0;-I/usr/local/Cellar/glib/2.50.2/lib/glib-2.0/include;-I/usr/local/opt/gettext/include;-I/usr/local/Cellar/pcre/8.39/include
 2230: HARFBUZZ_CFLAGS_I:INTERNAL=
 2231: HARFBUZZ_CFLAGS_OTHER:INTERNAL=
 2232: HARFBUZZ_FOUND:INTERNAL=1
 2233: HARFBUZZ_INCLUDEDIR:INTERNAL=/usr/local/Cellar/harfbuzz/1.3.3_1/include
 2234: HARFBUZZ_INCLUDE_DIRS:INTERNAL=/usr/local/Cellar/harfbuzz/1.3.3_1/include/harfbuzz;/usr/local/Cellar/glib/2.50.2/include/glib-2.0;/usr/local/Cellar/glib/2.50.2/lib/glib-2.0/include;/usr/local/opt/gettext/include;/usr/local/Cellar/pcre/8.39/include
 2235: HARFBUZZ_LDFLAGS:INTERNAL=-L/usr/local/Cellar/harfbuzz/1.3.3_1/lib;-lharfbuzz
 2236: HARFBUZZ_LDFLAGS_OTHER:INTERNAL=
 2237: HARFBUZZ_LIBDIR:INTERNAL=/usr/local/Cellar/harfbuzz/1.3.3_1/lib
 2238: HARFBUZZ_LIBRARIES:INTERNAL=harfbuzz
 2239: HARFBUZZ_LIBRARY_DIRS:INTERNAL=/usr/local/Cellar/harfbuzz/1.3.3_1/lib
 2240: HARFBUZZ_LIBS:INTERNAL=
 2241: HARFBUZZ_LIBS_L:INTERNAL=
 2242: HARFBUZZ_LIBS_OTHER:INTERNAL=
 2243: HARFBUZZ_LIBS_PATHS:INTERNAL=
 2244: HARFBUZZ_PREFIX:INTERNAL=/usr/local/Cellar/harfbuzz/1.3.3_1
 2245: HARFBUZZ_STATIC_CFLAGS:INTERNAL=-I/usr/local/Cellar/harfbuzz/1.3.3_1/include/harfbuzz;-I/usr/local/Cellar/glib/2.50.2/include/glib-2.0;-I/usr/local/Cellar/glib/2.50.2/lib/glib-2.0/include;-I/usr/local/opt/gettext/include;-I/usr/local/Cellar/pcre/8.39/include
 2246: HARFBUZZ_STATIC_CFLAGS_I:INTERNAL=
 2247: HARFBUZZ_STATIC_CFLAGS_OTHER:INTERNAL=
 2248: HARFBUZZ_STATIC_INCLUDE_DIRS:INTERNAL=/usr/local/Cellar/harfbuzz/1.3.3_1/include/harfbuzz;/usr/local/Cellar/glib/2.50.2/include/glib-2.0;/usr/local/Cellar/glib/2.50.2/lib/glib-2.0/include;/usr/local/opt/gettext/include;/usr/local/Cellar/pcre/8.39/include
 2249: HARFBUZZ_STATIC_LDFLAGS:INTERNAL=-L/usr/local/Cellar/harfbuzz/1.3.3_1/lib;-L/usr/local/Cellar/glib/2.50.2/lib;-L/usr/local/opt/gettext/lib;-L/usr/local/Cellar/pcre/8.39/lib;-lharfbuzz;-framework;ApplicationServices;-lglib-2.0;-lintl;-lpcre;-lintl;-liconv;-Wl,-framework,Carbon;-Wl,-framework,Foundation;-lpcre;-D_THREAD_SAFE;-pthread
 2250: HARFBUZZ_STATIC_LDFLAGS_OTHER:INTERNAL=-framework;ApplicationServices;-Wl,-framework,Carbon;-Wl,-framework,Foundation;-D_THREAD_SAFE;-pthread
 2251: HARFBUZZ_STATIC_LIBDIR:INTERNAL=
 2252: HARFBUZZ_STATIC_LIBRARIES:INTERNAL=harfbuzz;glib-2.0;intl;pcre;intl;iconv;pcre
 2253: HARFBUZZ_STATIC_LIBRARY_DIRS:INTERNAL=/usr/local/Cellar/harfbuzz/1.3.3_1/lib;/usr/local/Cellar/glib/2.50.2/lib;/usr/local/opt/gettext/lib;/usr/local/Cellar/pcre/8.39/lib
 2254: HARFBUZZ_STATIC_LIBS:INTERNAL=
 2255: HARFBUZZ_STATIC_LIBS_L:INTERNAL=
 2256: HARFBUZZ_STATIC_LIBS_OTHER:INTERNAL=
 2257: HARFBUZZ_STATIC_LIBS_PATHS:INTERNAL=
 2258: HARFBUZZ_VERSION:INTERNAL=1.3.3
 2259: HARFBUZZ_harfbuzz_INCLUDEDIR:INTERNAL=
 2260: HARFBUZZ_harfbuzz_LIBDIR:INTERNAL=
 2261: HARFBUZZ_harfbuzz_PREFIX:INTERNAL=
 2262: HARFBUZZ_harfbuzz_VERSION:INTERNAL=
 2597: //Module opencv_freetype will not be built in current configuration
 2598: HAVE_opencv_freetype:INTERNAL=OFF
 2750: OPENCV_MODULES_DISABLED_USER:INTERNAL=opencv_world;opencv_contrib_world;opencv_freetype
 3186: OPENCV_MODULE_opencv_freetype_BINARY_DIR:INTERNAL=/Users/logic/Desktop/opencv_contrib/build/modules/freetype
 3187: //List of opencv_freetype submodules
 3188: OPENCV_MODULE_opencv_freetype_CHILDREN:INTERNAL=
 3190: OPENCV_MODULE_opencv_freetype_CLASS:INTERNAL=PUBLIC
 3191: //Flattened dependencies of opencv_freetype module (for linker)
 3192: OPENCV_MODULE_opencv_freetype_DEPS_TO_LINK:INTERNAL=opencv_core;opencv_imgproc
 3193: //Brief description of opencv_freetype module
 3194: OPENCV_MODULE_opencv_freetype_DESCRIPTION:INTERNAL=FreeType module. It enables to draw strings with outlines and mono-bitmaps/gray-bitmaps.
 3195: //List of header files for opencv_freetype
 3196: OPENCV_MODULE_opencv_freetype_HEADERS:INTERNAL=/Users/logic/Desktop/opencv_contrib/modules/freetype/include/opencv2/freetype.hpp
 3197: OPENCV_MODULE_opencv_freetype_IS_PART_OF_WORLD:INTERNAL=OFF
 3198: OPENCV_MODULE_opencv_freetype_LABEL:INTERNAL=Extra;opencv_freetype
 3199: OPENCV_MODULE_opencv_freetype_LINK_DEPS:INTERNAL=
 3200: //Location of opencv_freetype module sources
 3201: OPENCV_MODULE_opencv_freetype_LOCATION:INTERNAL=/Users/logic/Desktop/opencv_contrib/modules/freetype
 3202: //Optional dependencies of opencv_freetype module
 3203: OPENCV_MODULE_opencv_freetype_OPT_DEPS:INTERNAL=
 3204: //Optional private dependencies of opencv_freetype module
 3205: OPENCV_MODULE_opencv_freetype_PRIVATE_OPT_DEPS:INTERNAL=
 3206: //Required private dependencies of opencv_freetype module
 3207: OPENCV_MODULE_opencv_freetype_PRIVATE_REQ_DEPS:INTERNAL=
 3208: //Required dependencies of opencv_freetype module
 3209: OPENCV_MODULE_opencv_freetype_REQ_DEPS:INTERNAL=opencv_core;opencv_imgproc
 3210: //List of source files for opencv_freetype
 3211: OPENCV_MODULE_opencv_freetype_SOURCES:INTERNAL=/Users/logic/Desktop/opencv_contrib/modules/freetype/src/freetype.cpp;/Users/logic/Desktop/opencv_contrib/modules/freetype/src/precomp.hpp
 3212: //List of wrappers supporting module opencv_freetype
 3213: OPENCV_MODULE_opencv_freetype_WRAPPERS:INTERNAL=python2;python3
 3643: OPENCV_MODULE_opencv_python2_OPT_DEPS:INTERNAL=opencv_calib3d;opencv_core;opencv_features2d;opencv_flann;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;opencv_objdetect;opencv_photo;opencv_shape;opencv_stitching;opencv_superres;opencv_video;opencv_videoio;opencv_videostab;opencv_aruco;opencv_bgsegm;opencv_bioinspired;opencv_ccalib;opencv_datasets;opencv_dnn;opencv_dpm;opencv_face;opencv_freetype;opencv_fuzzy;opencv_hdf;opencv_line_descriptor;opencv_optflow;opencv_phase_unwrapping;opencv_plot;opencv_reg;opencv_rgbd;opencv_saliency;opencv_structured_light;opencv_surface_matching;opencv_text;opencv_tracking;opencv_xfeatures2d;opencv_ximgproc;opencv_xobjdetect;opencv_xphoto
 3655: OPENCV_MODULE_opencv_python3_OPT_DEPS:INTERNAL=opencv_calib3d;opencv_core;opencv_features2d;opencv_flann;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;opencv_objdetect;opencv_photo;opencv_shape;opencv_stitching;opencv_superres;opencv_video;opencv_videoio;opencv_videostab;opencv_aruco;opencv_bgsegm;opencv_bioinspired;opencv_ccalib;opencv_datasets;opencv_dnn;opencv_dpm;opencv_face;opencv_freetype;opencv_fuzzy;opencv_hdf;opencv_line_descriptor;opencv_optflow;opencv_phase_unwrapping;opencv_plot;opencv_reg;opencv_rgbd;opencv_saliency;opencv_structured_light;opencv_surface_matching;opencv_text;opencv_tracking;opencv_xfeatures2d;opencv_ximgproc;opencv_xobjdetect;opencv_xphoto
 4354: PROJECT_opencv_freetype_GUID_CMAKE:INTERNAL=5C2487974F9E4F06BB4775C0
 4528: __pkg_config_checked_FREETYPE:INTERNAL=1
 4529: __pkg_config_checked_HARFBUZZ:INTERNAL=1
 5002: opencv_freetype_GUID_CMAKE:INTERNAL=25F2E89C908841FEAAECCC70

logic1988 on 26 Dec 2016

I think ocv_define_module() line in opencv_contrib/module/freetype/CMakeFile.txt will cause this problem.
FREETYPE_INCLUDE_DIRS and HARFBUZZ_INCLUDE_DIRS seems to be used with clang.
But freetype2_LIBRARIES and harfbuzz_LIBRARIES do not seem to be used with ld.

ocv_define_module(freetype opencv_core opencv_imgproc PRIVATE_REQUIRED ${freetype2_LIBRARIES} ${harfbuzz_LIBRARIES} WRAP python)
ocv_include_directories( ${FREETYPE_INCLUDE_DIRS} ${HARFBUZZ_INCLUDE_DIRS} )

Following works well in Ubuntu 16.04 LTS. Would you try this fix in macOS10.12 ?

ocv_define_module(freetype opencv_core opencv_imgproc PRIVATE_REQUIRED ${FREETYPE_LIBRARIES} ${HARFBUZZ_LIBRARIES} WRAP python)

Kumataro on 26 Dec 2016

👍7 🎉4

I got the same problem while compile in macos with the same env.

@Kumataro your ubuntu version solved this problem. Thanks

Jazznight on 26 Dec 2016

on line 22 of opencv-freetype CMakefile, change ${freetype2_LIBRARIES} ${harfbuzz_LIBRARIES} to ${FREETYPE_LIBRARIES} ${HARFBUZZ_LIBRARIES}

mikeseven on 29 Dec 2016

👍19 🎉4

thank you @Kumataro @mikeseven ,that helped , solved the problem in ubuntu.

bharathkotari on 10 Jul 2017

I am still getting the same Import Error after modifying the /home/avinashr175/opencv/opencv_contrib-3.2.0/modules/freetype/CMakeLists.txt file.

avinashr175 on 11 Jul 2017

@avinashr175 did you build and installed opencv again after modifying that CMakelists.txt file ?
i build and installed opencv once again on my ubuntu 14.04 . that worked for me.

bharathkotari on 11 Jul 2017

Thanks a lot @bharathkotari. I built and installed opencv once again and it worked.

avinashr175 on 12 Jul 2017

The fix didn't work for me on ubuntu 16.04
Aftet making the change I get 4 warning messages for 2 directories:
WARNING: Target "opencv_freetype" requests linking to directory "/usr/include/freetype2". Targets may link only to libraries. CMake is dropping the item.

Directories:

/usr/include/freetype2
/usr/include/harfbuzz

And after changing line 22 in cmake, configure, make, make install, still get the same error:
ImportError: /usr/local/lib/libopencv_freetype.so.3.2: undefined symbol: hb_shape

GeorgeKesaev on 14 Oct 2017

Thank you and please could you tell us what timing the "ImportError" message shown ?

Step 0) execute cmake to generate Makefile
-> "WARNING .. " is shown, and cmake is failed..
Step1) fix changing line 22
Step 2) execute cmake to generate Makefile.
Step 3) make to build libraries
Step 4) make install to install libraries into your system.
Step 5) make your application with opencv_freetype module with freetype and harfbuzz libraries.

If the ImportError message is shown in step 2 or 3, could you try to remove CMakeCache.txt and rerun cmake command ? This cache file keep some partial result that cmake command executed in step 0, so that it may works wrong.

If the ImportError message is shown in step 5, could you confirm your linker option for your application ? The Linker should know the location of harfbuzz and freetype libraries to use the functions which is defined in these libraries.

Following is Makefile example.

a.out : a.cpp
        g++ a.cpp -O2 -o a.out `pkg-config opencv freetype2 harfbuzz --cflags --libs`

Kumataro on 14 Oct 2017

Hey, sorry, I cannot recreate the error, I was working with docker image and tried to install it again, this time without any warnings or errors.

Thank you.

GeorgeKesaev on 14 Oct 2017

I'm experiencing this issue as well:

[0] % python
Python 2.7.12 (default, Nov 19 2016, 06:48:10) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /usr/local/lib/libopencv_freetype.so.3.2: undefined symbol: FT_Set_Pixel_Sizes
>>>

I'm using OpenCV 3.2 compiled from source on a Ubuntu 16.04.

dzhoshkun on 10 Nov 2017

This line causes the problem on my system, as I'm using version 3.2 of the contrib modules.
But I've noticed this has been fixed on the master branch.
So please ignore my comment above.

dzhoshkun on 10 Nov 2017

This error still even exists in the official release of opencv in the Ubuntu/Debian repository. On a fresh ubuntu 18.04, simply doing

sudo apt-get install libopencv-dev
ldd -r /usr/lib/x86_64-linux-gnu/libopencv_freetype.so

pops out the following errors:

undefined symbol: FT_Set_Pixel_Sizes    (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: hb_shape  (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_Load_Glyph (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: hb_buffer_guess_segment_properties    (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: hb_ft_font_create (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_Outline_Transform  (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: hb_buffer_destroy (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_Init_FreeType  (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_Outline_Decompose  (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_Outline_Translate  (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: hb_font_destroy   (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_Done_FreeType  (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: hb_buffer_add_utf8    (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: hb_buffer_get_glyph_infos (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_New_Face   (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_Render_Glyph   (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: FT_Done_Face  (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)
undefined symbol: hb_buffer_create  (/usr/lib/x86_64-linux-gnu/libopencv_freetype.so)

bwehbe on 2 Apr 2019

To contact with https://bugs.launchpad.net/ubuntu/+source/opencv/+bug/1753928 is helpful to fix this problem.

In 2018, "OpenCV version in bionic is old" is reported at ubuntu community ( *1 ) .
OpenCV package is updated from 3.1 to 3.2 + CVE patches for bionic, cosmic and disco.
However this patch seems to not include with it

*1 https://answers.launchpad.net/ubuntu/+source/opencv/+question/665324

Kumataro on 2 Apr 2019

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