[FFmpeg-user] ffmpeg fails to compile with opencv of Fedora 25

[pgaltieri .]

I have checked out the latest version of ffmpeg from Git repository and for
the last week when I try to compile it I get

ERROR: opencv not found

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user at ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.

I have the opencv libraries installed.  The error comes from the following:

BEGIN /tmp/ffconf.N7phMWii.c
    1   #include <opencv2/core/core_c.h>
    2   #include <stdint.h>
    3   long check_cvCreateImageHeader(void) { return (long)
cvCreateImageHeader; }
    4   int main(void) { int ret = 0;
    5    ret |= ((intptr_t)check_cvCreateImageHeader) & 0xFFFF;
    6   return ret; }
END /tmp/ffconf.N7phMWii.c
gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
-D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC
-I/usr/include/opencl-utils -std=c11 -fomit-frame-pointer -fPIC -pthread
-I/usr/include/harfbuzz -I/usr/include/glib-2.0
-I/usr/lib64/glib-2.0/include -I/usr/include/freetype2
-I/usr/include/libpng16 -I/usr/include/fribidi -I/usr/include/freetype2
-I/usr/include/libpng16 -I/usr/include/opencv -c -o /tmp/ffconf.JalceQGi.o
/tmp/ffconf.N7phMWii.c
gcc -L/usr/local/lib64 -Wl,--as-needed -Wl,-z,noexecstack
-I/usr/include/opencv -o /tmp/ffconf.Fy5RqLpT /tmp/ffconf.JalceQGi.o
-lopencv_shape -lopencv_stitching -lopencv_superres -lopencv_videostab
-lopencv_aruco -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib
-lopencv_cvv -lopencv_dnn -lopencv_dpm -lopencv_fuzzy -lopencv_hdf
-lopencv_line_descriptor -lopencv_optflow -lopencv_plot -lopencv_reg
-lopencv_saliency -lopencv_stereo -lopencv_structured_light -lopencv_rgbd
-lopencv_surface_matching -lopencv_tracking -lopencv_datasets -lopencv_text
-lopencv_face -lopencv_video -lopencv_ximgproc -lopencv_calib3d
-lopencv_features2d -lopencv_flann -lopencv_xobjdetect -lopencv_objdetect
-lopencv_ml -lopencv_xphoto -lopencv_highgui -lopencv_videoio
-lopencv_imgcodecs -lopencv_photo -lopencv_imgproc -lopencv_core
-lopencore-amrwb -lopencore-amrnb -lmp3lame -lgsm -lass -lcrystalhd -lm
-llzma -lbz2 -lz -pthread
/tmp/ffconf.JalceQGi.o: In function `cvPointFrom32f':
ffconf.N7phMWii.c:(.text+0x5ca): undefined reference to `cvRound'
ffconf.N7phMWii.c:(.text+0x5e2): undefined reference to `cvRound'
/tmp/ffconf.JalceQGi.o: In function `cvReadInt':
ffconf.N7phMWii.c:(.text+0xf00): undefined reference to `cvRound'
collect2: error: ld returned 1 exit status

This is from config.log.

I don't know what the exact change is, but this code needs to be compiled
 with g++ not gcc.

Any assistance is appreciated.

Paolo
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