emmake make

Stephan:emsdk stephanschulz$ source ./emsdk_env.sh
Adding directories to PATH:
PATH += /Users/stephanschulz/emsdk
PATH += /Users/stephanschulz/emsdk/clang/e1.38.9_64bit
PATH += /Users/stephanschulz/emsdk/node/8.9.1_64bit/bin
PATH += /Users/stephanschulz/emsdk/emscripten/1.38.9

Setting environment variables:
EMSDK = /Users/stephanschulz/emsdk
EM_CONFIG = /Users/stephanschulz/.emscripten
LLVM_ROOT = /Users/stephanschulz/emsdk/clang/e1.38.9_64bit
EMSCRIPTEN_NATIVE_OPTIMIZER = /Users/stephanschulz/emsdk/clang/e1.38.9_64bit/optimizer
BINARYEN_ROOT = /Users/stephanschulz/emsdk/clang/e1.38.9_64bit/binaryen
EMSDK_NODE = /Users/stephanschulz/emsdk/node/8.9.1_64bit/bin/node
EMSCRIPTEN = /Users/stephanschulz/emsdk/emscripten/1.38.9

Stephan:emsdk stephanschulz$ cd /Applications/of_v20191201_osx_release/examples/gui/guiExample 
Stephan:guiExample stephanschulz$ emmake make
Compiling OF library for Release
Done!


Compiling guiExample for Release
Linking bin/guiExample.html for emscripten
/Users/stephanschulz/emsdk/emscripten/1.38.9/em++ -o bin/guiExample.html -O3 -s TOTAL_MEMORY=134217728 --memory-init-file 1 obj/emscripten/Release/src/ofApp.o obj/emscripten/Release/src/main.o  /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenSoundStream.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenVideoPlayer.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenSoundPlayer.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenVideoGrabber.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenURLFileLoader.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxAppEmscriptenWindow.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxBaseGui.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxColorPicker.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxSliderGroup.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxToggle.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxButton.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxGuiGroup.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxInputField.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxLabel.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxPanel.o /Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxSlider.o  /Applications/of_v20191201_osx_release/libs/openFrameworksCompiled/lib/emscripten/libopenFrameworks.bc   -Wl,--as-needed -Wl,--gc-sections --preload-file bin/data@data --emrun --js-library /Applications/of_v20191201_osx_release/addons/ofxEmscripten/libs/html5video/lib/emscripten/library_html5video.js --js-library /Applications/of_v20191201_osx_release/addons/ofxEmscripten/libs/html5audio/lib/emscripten/library_html5audio.js --shell-file /Applications/of_v20191201_osx_release/libs/openFrameworksCompiled/project/emscripten/template.html /Applications/of_v20191201_osx_release/libs/FreeImage/lib/emscripten/libfreeimage.a /Applications/of_v20191201_osx_release/libs/boost/lib/emscripten/libboost_system.a /Applications/of_v20191201_osx_release/libs/boost/lib/emscripten/libboost_filesystem.a /Applications/of_v20191201_osx_release/libs/freetype/lib/emscripten/libfreetype.bc /Applications/of_v20191201_osx_release/libs/pugixml/lib/emscripten/libpugixml.bc /Applications/of_v20191201_osx_release/libs/tess2/lib/emscripten/libtess2.a /Applications/of_v20191201_osx_release/libs/uriparser/lib/emscripten/liburiparser.a    
WARNING:root:obj/emscripten/Release/src/ofApp.o is not valid LLVM bitcode
WARNING:root:obj/emscripten/Release/src/main.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenSoundStream.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenVideoPlayer.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenSoundPlayer.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenVideoGrabber.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxEmscriptenURLFileLoader.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxEmscripten/src/ofxAppEmscriptenWindow.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxBaseGui.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxColorPicker.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxSliderGroup.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxToggle.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxButton.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxGuiGroup.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxInputField.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxLabel.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxPanel.o is not valid LLVM bitcode
WARNING:root:/Applications/of_v20191201_osx_release/addons/obj/emscripten/Release/ofxGui/src/ofxSlider.o is not valid LLVM bitcode
warning: unresolved symbol: _ZN24ofxEmscriptenSoundStreamC1Ev
warning: unresolved symbol: _ZN24ofxEmscriptenSoundStreamD1Ev
warning: unresolved symbol: _ZNKSt3__212basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE5rfindEcm
warning: unresolved symbol: _ZNKSt3__212basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7compareEmmPKcm
warning: unresolved symbol: _ZNSt3__212basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6appendEPKcm
warning: unresolved symbol: _ZNSt3__212basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6appendEmc
warning: unresolved symbol: _ZNSt3__212basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6resizeEmc
warning: unresolved symbol: _ZNSt3__212basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE7replaceEmmPKcm
warning: unresolved symbol: _ZNSt3__212basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEC1ERKS5_mmRKS4_
warning: unresolved symbol: _ZNSt3__213basic_ostreamIcNS_11char_traitsIcEEE5writeEPKcl
warning: unresolved symbol: _Znam
warning: unresolved symbol: _ZnamRKSt9nothrow_t
warning: unresolved symbol: _Znwm
warning: unresolved symbol: _ZnwmRKSt9nothrow_t

     compiling done
     to launch the application on the default browser, run:

     emrun bin/guiExample.html
     
     some browsers, like safari, don't support webgl
     
emrun has automatically found the following browsers in the default install locations on the system:

  - firefox: Mozilla Firefox 70.0.1
  - chrome: Google Chrome 78.0.3904.108
  - safari: Apple Safari 12.1.2

You can pass the --browser <id> option to launch with the given browser above.
Even if your browser was not detected, you can use --browser /path/to/browser/executable to launch with that browser.