OS X g++ not finding OpenCV libraries - c++

Question

I have OpenCV 3.3.1 installed on OS 10.13.1 using Homebrew, and I'm getting a linker problem I can't diagnose. Does anyone have a clue what might be going on?
Command line:
g++ backsub.cpp `pkg-config --libs --cflags opencv` -o backsub
Returns the following error message:
ld: library not found for -llibopencv_stitching.3.3.1.dylib
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Using the -v option gives, for the linker section (hard wrapped to make it easier to read):
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.
xctoolchain/usr/bin/ld" -demangle -lto_library
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.
xctoolchain/usr/lib/libLTO.dylib -no_deduplicate -dynamic -arch x86_64
-macosx_version_min 10.13.0 -o backsub
-L/usr/local/Cellar/opencv/3.3.1_1/lib
/var/folders/zn/p7grv7lj49lfdrvrtn7mp1kh0000gn/T/backsub-2eda30.o
-llibopencv_stitching.3.3.1.dylib -llibopencv_superres.3.3.1.dylib
-llibopencv_videostab.3.3.1.dylib -llibopencv_photo.3.3.1.dylib
-llibopencv_aruco.3.3.1.dylib -llibopencv_bgsegm.3.3.1.dylib
-llibopencv_bioinspired.3.3.1.dylib -llibopencv_ccalib.3.3.1.dylib
-llibopencv_dpm.3.3.1.dylib -llibopencv_face.3.3.1.dylib
-llibopencv_fuzzy.3.3.1.dylib -llibopencv_img_hash.3.3.1.dylib
-llibopencv_line_descriptor.3.3.1.dylib -llibopencv_optflow.3.3.1.dylib
-llibopencv_reg.3.3.1.dylib -llibopencv_rgbd.3.3.1.dylib
-llibopencv_saliency.3.3.1.dylib -llibopencv_stereo.3.3.1.dylib
-llibopencv_structured_light.3.3.1.dylib
-llibopencv_phase_unwrapping.3.3.1.dylib
-llibopencv_surface_matching.3.3.1.dylib
-llibopencv_tracking.3.3.1.dylib -llibopencv_datasets.3.3.1.dylib
-llibopencv_text.3.3.1.dylib -llibopencv_dnn.3.3.1.dylib
-llibopencv_plot.3.3.1.dylib -llibopencv_xfeatures2d.3.3.1.dylib
-llibopencv_shape.3.3.1.dylib -llibopencv_video.3.3.1.dylib
-llibopencv_ml.3.3.1.dylib -llibopencv_ximgproc.3.3.1.dylib
-llibopencv_calib3d.3.3.1.dylib -llibopencv_features2d.3.3.1.dylib
-llibopencv_highgui.3.3.1.dylib -llibopencv_videoio.3.3.1.dylib
-llibopencv_flann.3.3.1.dylib -llibopencv_xobjdetect.3.3.1.dylib
-llibopencv_imgcodecs.3.3.1.dylib -llibopencv_objdetect.3.3.1.dylib
-llibopencv_xphoto.3.3.1.dylib -llibopencv_imgproc.3.3.1.dylib
-llibopencv_core.3.3.1.dylib -lc++ -lSystem
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.
xctoolchain/usr/lib/clang/9.0.0/lib/darwin/libclang_rt.osx.a
ld: library not found for -llibopencv_stitching.3.3.1.dylib
clang: error: linker command failed with exit code 1 (use -v to see invocation)
pkg-config seems to be doing the right things. All of the dylibs are in /usr/local/Cellar/opencv/3.3.1_1/lib and have the exact filenames specified in the command line. For some reason the linker isn't seeing them. Thanks for any help!