Build and install OpenCV in Termux
1. Install "python"
% pkg install python
2. Try to install "numpy"
2.1 Prepare "libm.so"
Check if you have libm in $PREFIX/lib
% ls -al $PREFIX/lib | grep libm
If you could not find "libm.so" in $PREFIX/lib, bring it from /system/lib to $PREFIX/lib
(this step is needed for building opencv later on also)
% ln -s /system/lib/libm.so $PREFIX/lib/libm.so
2.2 Install "numpy"
% LDFLAGS="-lm -lcompiler_rt" pip install --no-cache-dir numpy
Note: without "LDFLAGS=..." part, you might get the following error
Python 3.8.0 (default, Dec 5 2019, 10:21:08)
[Clang 8.0.7 (https://android.googlesource.com/toolchain/clang b55f2d4ebfd35bf6 on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/data/data/com.termux/files/usr/lib/python3.8/site-packages/numpy/__init__.py", line 142, in
from . import core
File "/data/data/com.termux/files/usr/lib/python3.8/site-packages/numpy/core/__init__.py", line 104, in
from . import _add_newdocs
File "/data/data/com.termux/files/usr/lib/python3.8/site-packages/numpy/core/_add_newdocs.py", line 4441, in
add_newdoc('numpy.core._multiarray_tests', 'format_float_OSprintf_g',
File "/data/data/com.termux/files/usr/lib/python3.8/site-packages/numpy/core/function_base.py", line 506, in add_newdoc
new = getattr(__import__(place, globals(), {}, [obj]), obj)
ImportError: dlopen failed: cannot locate symbol "tanh" referenced by "_multiarray_tests.cpython-38.so"...
>>>
2.3 Test if we can import numpy to make sure it's installed correctly
3. Build "opencv"
3.1 Install some libraries
% pkg install cmake pkg-config libjpeg-turbo libpng
3.2 Clone source code of opencv
% cd storage/external-1
% git clone https://github.com/opencv/opencv.git
% cd opencv
% git checkout -b tag4.2.0 refs/tags/4.2.0
Then apply the following changes to opencv/modules/python/CMakeLists.txt
3.3 Run cmake to config before building
% cd opencv
% mkdir build && cd build
% LDFLAGS=" -L$PREFIX/lib/ -llog -lm -lpython3.8 " \
cmake \
-DOPENCV_SKIP_PYTHON_LOADER=OFF \
-DCMAKE_BUILD_TYPE=RELEASE \
-DCMAKE_INSTALL_PREFIX=$PREFIX \
-DOPENCV_ENABLE_NONFREE:BOOL=ON \
-DBUILD_opencv_python3:BOOL=ON \
-DBUILD_opencv_python2:BOOL=OFF \
-DPYTHON_EXECUTABLE=$PREFIX/bin/python3 \
-DPYTHON_DEFAULT_EXECUTABLE=$PREFIX/bin/python3 \
-DPYTHON3_EXECUTABLE=$PREFIX/bin/python3 \
-DPYTHON3_INCLUDE_DIR=/$PREFIX/include/python3.8 \
-DPYTHON3_INCLUDE_DIR2=/$PREFIX/include/python3.8 \
-DPYTHON3_LIBRARIES=$PREFIX/lib/python3.8.so \
-DPYTHON3_INCLUDE_PATH=$PREFIX/include/python3.8 \
-DPYTHON3_LIBRARY=$PREFIX/lib/libpython3.8.so \
-DPYTHON3LIBS_VERSION_STRING=3.8 \
-DPYTHON3_PACKAGES_PATH=$PREFIX/lib/python3.8/site-packages \
-DPYTHON3_NUMPY_INCLUDE_DIRS=$PREFIX/lib/python3.8/site-packages/numpy/core/include \
-DPYTHON3_NUMPY_VERSION=1.18.2\
-DBUILD_JAVA=OFF \
-DBUILD_ANDROID_PROJECTS=OFF \
-DBUILD_ANDROID_EXAMPLES=OFF \
-DWITH_QT=OFF \
-DWITH_GTK=OFF \
-DWITH_TEST=OFF \
-DBUILD_TESTS=OFF \
-DBUILD_EXAMPLES=OFF ..
After the step above, you should get the following result, check if "python3" is included in "to be built" module list...
-- The CXX compiler identification is Clang 9.0.0
-- The C compiler identification is Clang 9.0.0
-- Check for working CXX compiler: /data/data/com.termux/files/usr/bin/c++
-- Check for working CXX compiler: /data/data/com.termux/files/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Check for working C compiler: /data/data/com.termux/files/usr/bin/cc
-- Check for working C compiler: /data/data/com.termux/files/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Detected processor: x86_64
-- sizeof(void) = 4 on 64 bit processor. Assume 32-bit compilation mode
-- Found PythonInterp: /data/data/com.termux/files/usr/bin/python3 (found suitable version "3.8", minimum required is "2.7")
CMake Warning at cmake/OpenCVDetectPython.cmake:81 (message):
CMake's 'find_host_package(PythonInterp 2.7)' founds wrong Python version:
PYTHON_EXECUTABLE=/data/data/com.termux/files/usr/bin/python3
PYTHON_VERSION_STRING=3.8
Consider specify 'PYTHON2_EXECUTABLE' variable via CMake command line or
environment variables
Call Stack (most recent call first):
cmake/OpenCVDetectPython.cmake:271 (find_python)
CMakeLists.txt:585 (include)
-- Found Python2: /data/data/com.termux/files/usr/bin/python2.7 (found version "2.7.17") found components: Interpreter
-- Found PythonInterp: /data/data/com.termux/files/usr/bin/python2.7 (found version "2.7.17")
-- Found PythonInterp: /data/data/com.termux/files/usr/bin/python3 (found suitable version "3.8", minimum required is "3.2")
-- Looking for ccache - not found
-- Performing Test HAVE_CXX_FSIGNED_CHAR
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-- Performing Test HAVE_CXX_WNO_UNNAMED_TYPE_TEMPLATE_ARGS
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-- Performing Test HAVE_CXX_MSSE (check file: cmake/checks/cpu_sse.cpp)
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-- Performing Test HAVE_CXX_MSSE4_1 - Success
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-- Performing Test HAVE_CXX_MPOPCNT - Success
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-- Performing Test HAVE_CXX_MSSE4_2 - Success
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-- Performing Test HAVE_CXX_MF16C - Success
-- Performing Test HAVE_CXX_MAVX (check file: cmake/checks/cpu_avx.cpp)
-- Performing Test HAVE_CXX_MAVX - Success
-- Performing Test HAVE_CPU_BASELINE_FLAGS
-- Performing Test HAVE_CPU_BASELINE_FLAGS - Success
-- Performing Test HAVE_CPU_DISPATCH_FLAGS_SSE4_1
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-- Performing Test HAVE_CPU_DISPATCH_FLAGS_AVX - Success
-- Performing Test HAVE_CXX_MFPMATH_SSE
-- Performing Test HAVE_CXX_MFPMATH_SSE - Success
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-- Performing Test HAVE_C_MFPMATH_SSE - Success
-- Performing Test HAVE_CXX_FVISIBILITY_HIDDEN
-- Performing Test HAVE_CXX_FVISIBILITY_HIDDEN - Success
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-- Performing Test HAVE_C_FVISIBILITY_HIDDEN - Success
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-- Performing Test HAVE_CXX_FVISIBILITY_INLINES_HIDDEN - Success
-- Performing Test HAVE_C_FVISIBILITY_INLINES_HIDDEN
-- Performing Test HAVE_C_FVISIBILITY_INLINES_HIDDEN - Success
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for posix_memalign
-- Looking for posix_memalign - found
-- Looking for malloc.h
-- Looking for malloc.h - found
-- Looking for memalign
-- Looking for memalign - found
-- Check if the system is big endian
-- Searching 16 bit integer
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for stdint.h
-- Looking for stdint.h - found
-- Looking for stddef.h
-- Looking for stddef.h - found
-- Check size of unsigned short
-- Check size of unsigned short - done
-- Using unsigned short
-- Check if the system is big endian - little endian
-- Found ZLIB: /data/data/com.termux/files/usr/lib/libz.so (found suitable version "1.2.11", minimum required is "1.2.3")
-- Performing Test HAVE_C_WNO_UNUSED_PARAMETER
-- Performing Test HAVE_C_WNO_UNUSED_PARAMETER - Success
-- Performing Test HAVE_C_WNO_SIGN_COMPARE
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-- Performing Test HAVE_C_WNO_SHORTEN_64_TO_32
-- Performing Test HAVE_C_WNO_SHORTEN_64_TO_32 - Success
-- Performing Test HAVE_C_WNO_IMPLICIT_FALLTHROUGH
-- Performing Test HAVE_C_WNO_IMPLICIT_FALLTHROUGH - Success
-- libjpeg-turbo: VERSION = 2.0.2, BUILD = opencv-4.2.0-libjpeg-turbo
-- Check size of size_t
-- Check size of size_t - done
-- Check size of unsigned long
-- Check size of unsigned long - done
-- Performing Test HAVE_BUILTIN_CTZL
-- Performing Test HAVE_BUILTIN_CTZL - Success
-- Looking for include file locale.h
-- Looking for include file locale.h - found
-- Looking for include file stdlib.h
-- Looking for include file stdlib.h - found
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-- Looking for assert.h
-- Looking for assert.h - found
-- Looking for dlfcn.h
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-- Looking for io.h
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-- Looking for search.h
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-- Looking for string.h
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-- Looking for sys/time.h
-- Looking for sys/time.h - found
-- Looking for unistd.h
-- Looking for unistd.h - found
-- Performing Test C_HAS_inline
-- Performing Test C_HAS_inline - Success
-- Check size of signed short
-- Check size of signed short - done
-- Check size of unsigned short
-- Check size of unsigned short - done
-- Check size of signed int
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-- Check size of unsigned long long
-- Check size of unsigned long long - done
-- Check size of unsigned char *
-- Check size of unsigned char * - done
-- Check size of ptrdiff_t
-- Check size of ptrdiff_t - done
-- Check size of INT8
-- Check size of INT8 - failed
-- Check size of INT16
-- Check size of INT16 - failed
-- Check size of INT32
-- Check size of INT32 - failed
-- Looking for floor
-- Looking for floor - found
-- Looking for pow
-- Looking for pow - found
-- Looking for sqrt
-- Looking for sqrt - found
-- Looking for isascii
-- Looking for isascii - found
-- Looking for memset
-- Looking for memset - found
-- Looking for mmap
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-- Looking for getopt
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-- Looking for setmode
-- Looking for setmode - not found
-- Looking for strcasecmp
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-- Looking for strtoull
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-- Looking for lfind
-- Looking for lfind - found
-- Performing Test HAVE_SNPRINTF
-- Performing Test HAVE_SNPRINTF - Success
-- Check if the system is big endian
-- Searching 16 bit integer
-- Using unsigned short
-- Check if the system is big endian - little endian
-- Performing Test HAVE_C_WNO_UNUSED_BUT_SET_VARIABLE
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-- Performing Test HAVE_C_WNO_MISSING_DECLARATIONS
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-- Performing Test HAVE_C_WNO_UNUSED
-- Performing Test HAVE_C_WNO_UNUSED - Success
-- Performing Test HAVE_C_WNO_CAST_ALIGN
-- Performing Test HAVE_C_WNO_CAST_ALIGN - Success
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-- Performing Test HAVE_C_WNO_SHADOW - Success
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-- Performing Test HAVE_C_WNO_POINTER_TO_INT_CAST
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-- Performing Test HAVE_C_WNO_UNINITIALIZED
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-- Performing Test HAVE_C_WNO_UNUSED_BUT_SET_PARAMETER
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-- Performing Test HAVE_C_WNO_ABSOLUTE_VALUE
-- Performing Test HAVE_C_WNO_ABSOLUTE_VALUE - Success
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-- Performing Test HAVE_C_WNO_STRICT_PROTOTYPES - Success
-- Looking for semaphore.h
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-- Performing Test HAVE_CXX_WNO_IGNORED_QUALIFIERS
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Android: Projects builds are DISABLED
-- Looking for dlerror in dl
-- Looking for dlerror in dl - found
-- OpenCV Python: during development append to PYTHONPATH: /data/data/com.termux/files/home/storage/external-1/opencv/build/python_loader
-- Excluding from source files list: modules/imgproc/src/imgwarp.avx2.cpp
-- Excluding from source files list: modules/imgproc/src/resize.avx2.cpp
-- Excluding from source files list: modules/imgproc/src/sumpixels.avx512_skx.cpp
-- Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': /data/data/com.termux/files/home/storage/external-1/opencv/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake
-- opencv_dnn: filter out ocl4dnn source code
-- opencv_dnn: filter out cuda4dnn source code
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx2.cpp
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx512_skx.cpp
-- Excluding from source files list: modules/features2d/src/fast.avx2.cpp
-- Performing Test HAVE_CXX_WNO_OVERLOADED_VIRTUAL
-- Performing Test HAVE_CXX_WNO_OVERLOADED_VIRTUAL - Success
-- Performing Test HAVE_CXX_WNO_UNUSED_PRIVATE_FIELD
-- Performing Test HAVE_CXX_WNO_UNUSED_PRIVATE_FIELD - Success
-- Android OpenCV Manager is ignored
--
-- General configuration for OpenCV 4.2.0 =====================================
-- Version control: 4.2.0-dirty
--
-- Platform:
-- Timestamp: 2020-03-24T10:54:58Z
-- Host: Android 3.10.20-x86_64_byt x86_64
-- CMake: 3.15.5
-- CMake generator: Unix Makefiles
-- CMake build tool: /data/data/com.termux/files/usr/bin/make
-- Configuration: RELEASE
--
-- CPU/HW features:
-- Baseline: SSE SSE2
-- requested: SSE2
-- Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX
-- requested: SSE4_1 SSE4_2 AVX FP16
-- SSE4_1 (13 files): + SSE3 SSSE3 SSE4_1
-- SSE4_2 (1 files): + SSE3 SSSE3 SSE4_1 POPCNT SSE4_2
-- FP16 (0 files): + SSE3 SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
-- AVX (4 files): + SSE3 SSSE3 SSE4_1 POPCNT SSE4_2 AVX
--
-- C/C++:
-- Built as dynamic libs?: NO
-- C++ Compiler: /data/data/com.termux/files/usr/bin/c++ (ver 9.0.0)
-- C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -msse -msse2 -mfpmath=sse -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -msse -msse2 -mfpmath=sse -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /data/data/com.termux/files/usr/bin/cc
-- C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -msse -msse2 -mfpmath=sse -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Winconsistent-missing-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -fdiagnostics-show-option -Qunused-arguments -msse -msse2 -mfpmath=sse -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -L/system/lib/ -L/data/data/com.termux/files/usr/lib/ -llog -lm -lpython3.8
-- Linker flags (Debug): -L/system/lib/ -L/data/data/com.termux/files/usr/lib/ -llog -lm -lpython3.8
-- ccache: NO
-- Precompiled headers: NO
-- Extra dependencies: z dl m log
-- 3rdparty dependencies: libcpufeatures ittnotify libprotobuf libjpeg-turbo libwebp libpng libtiff libjasper IlmImf quirc
--
-- OpenCV modules:
-- To be built: calib3d core dnn features2d flann highgui imgcodecs imgproc ml objdetect photo python3 stitching ts video videoio
-- Disabled: world
-- Disabled by dependency: -
-- Unavailable: gapi java js python2
-- Applications: perf_tests
-- Documentation: NO
-- Non-free algorithms: YES
--
-- Android NDK: location:
-- Android ABI:
-- STL type:
-- Native API level:
-- Android SDK: not used, projects are not built
--
-- GUI:
--
-- Media I/O:
-- ZLib: z (ver 1.2.11)
-- JPEG: build-libjpeg-turbo (ver 2.0.2-62)
-- WEBP: build (ver encoder: 0x020e)
-- PNG: build (ver 1.6.37)
-- TIFF: build (ver 42 - 4.0.10)
-- JPEG 2000: build (ver 1.900.1)
-- OpenEXR: build (ver 2.3.0)
-- HDR: YES
-- SUNRASTER: YES
-- PXM: YES
-- PFM: YES
--
-- Video I/O:
--
-- Parallel framework: pthreads
--
-- Trace: YES (with Intel ITT)
--
-- Other third-party libraries:
-- Eigen: NO
-- Custom HAL: NO
-- Protobuf: build (3.5.1)
--
-- Python 3:
-- Interpreter: /data/data/com.termux/files/usr/bin/python3 (ver 3.8)
-- Libraries: /data/data/com.termux/files/usr/lib/python3.8.so (ver 3.8)
-- numpy: /data/data/com.termux/files/usr/lib/python3.8/site-packages/numpy/core/include (ver 1.18.2-DBUILD_JAVA=OFF)
-- install path: /data/data/com.termux/files/usr/lib/python3.8/site-packages/cv2/python-3.8
--
-- Python (for build): /data/data/com.termux/files/usr/bin/python3
--
-- Java: export all functions
-- ant: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Install to: /data/data/com.termux/files/usr
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /data/data/com.termux/files/home/storage/external-1/opencv/build
3.4 Make and install
% make
% make install
3.5 Check
After all these steps, you should be able to "import cv2" in Python
