[GitHub] [incubator-mxnet] shawnbrar commented on issue #17359: Mxnet doesn't install for R if OpenCV is build on linux

[GitBox <gi...@apache.org>]

shawnbrar commented on issue #17359: Mxnet doesn't install for R if OpenCV is build on linux
URL: https://github.com/apache/incubator-mxnet/issues/17359#issuecomment-577014464
 
 
   I actually found the problem. When I type in `make -f R-package/Makefile rpkg`, the following output appears : 
   `make -f R-package/Makefile rpkg`
   
   --------------------------------------------------------------------------------------------------------------------
   mkdir -p R-package/inst/libs
   cp src/io/image_recordio.h R-package/src
   if [ -d "lib" ]; then \
   	cp -rf lib/libmxnet.so R-package/inst/libs; \
   	if [ -e "lib/libtvm_runtime.so" ]; then \
   		cp -rf lib/libtvm_runtime.so R-package/inst/libs; \
   	fi; \
   else \
   	cp -rf build/libmxnet.so R-package/inst/libs; \
   	if [ -e "build/libtvm_runtime.so" ]; then \
   		cp -rf build/libtvm_runtime.so R-package/inst/libs; \
   	fi; \
   fi
   mkdir -p R-package/inst/include
   cp -rl include/* R-package/inst/include
   Rscript -e "if(!require(devtools)){install.packages('devtools', repo = 'https://cloud.r-project.org/')}"
   Loading required package: devtools
   Loading required package: usethis
   Rscript -e "if(!require(roxygen2)||packageVersion('roxygen2') < '6.1.1'){install.packages('roxygen2', repo = 'https://cloud.r-project.org/')}"
   Loading required package: roxygen2
   Rscript -e "library(devtools); library(methods); options(repos=c(CRAN='https://cloud.r-project.org/')); install_deps(pkg='R-package', dependencies = TRUE)"
   Loading required package: usethis
   
   cp R-package/dummy.NAMESPACE R-package/NAMESPACE  # NAMESPACE will be replaced by devtools::document later
   echo "import(Rcpp)" >> R-package/NAMESPACE
   R CMD INSTALL R-package
   * installing to library ‘/home/shawnbrar/R/x86_64-pc-linux-gnu-library/3.6’
   * installing *source* package ‘mxnet’ ...
   ** using staged installation
   ** libs
   make[1]: Entering directory '/home/shawnbrar/Documents/Libs/mxnet/R-package/src'
   g++ -std=gnu++11 -I"/usr/share/R/include" -DNDEBUG -I../inst/include `pkg-config --cflags opencv` `Rscript -e 'Rcpp:::CxxFlags()'` -I"/home/shawnbrar/R/x86_64-pc-linux-gnu-library/3.6/Rcpp/include"   -fpic  -g -O2 -fdebug-prefix-map=/build/r-base-t3diwe/r-base-3.6.2=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g  -c im2rec.cc -o im2rec.o
   Package opencv was not found in the pkg-config search path.
   Perhaps you should add the directory containing `opencv.pc'
   to the PKG_CONFIG_PATH environment variable
   No package 'opencv' found
   im2rec.cc:39:10: fatal error: opencv2/opencv.hpp: No such file or directory
    #include <opencv2/opencv.hpp>
             ^~~~~~~~~~~~~~~~~~~~
   compilation terminated.
   /usr/lib/R/etc/Makeconf:175: recipe for target 'im2rec.o' failed
   make[1]: *** [im2rec.o] Error 1
   make[1]: Leaving directory '/home/shawnbrar/Documents/Libs/mxnet/R-package/src'
   ERROR: compilation failed for package ‘mxnet’
   * removing ‘/home/shawnbrar/R/x86_64-pc-linux-gnu-library/3.6/mxnet’
   * restoring previous ‘/home/shawnbrar/R/x86_64-pc-linux-gnu-library/3.6/mxnet’
   R-package/Makefile:5: recipe for target 'rpkg' failed
   make: *** [rpkg] Error 1
   --------------------------------------------------------------------------------------------------------------------
   
   In this the following is important to see : 
   `g++ -std=gnu++11 -I"/usr/share/R/include" -DNDEBUG -I../inst/include 'pkg-config --cflags opencv'`
   
   It says `pkg-config --cflags opencv`
   Whereas it should be `pkg-config --cflags opencv4`.
   
   What can I do to make this change? Should I rename my _opencv4.pc_ file to _opencv.pc_?

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