compiler error, build-mac/NarlyDriver.appex not found

Dear all,

I’m trying to compile a release build using the script, however when I run it, I get a compiler error for the AUv3App.

This project has been created with the IPlugFaustDSP example.

At this point I am quite clueless on how to solve this issue so I am looking for advice on where to start debugging and solving this issue.

PBXCp /Users/ruud/Projects/audio/iPlug2/projects/NarlyDriver/build-mac/NarlyDriver.appex /Users/ruud/Applications/ (in target 'AUv3App' from project 'NarlyDriver-macOS')
    cd /Users/ruud/Projects/audio/iPlug2/projects/NarlyDriver/projects
    builtin-copy -exclude .DS_Store -exclude CVS -exclude .svn -exclude .git -exclude .hg -exclude Headers -exclude PrivateHeaders -exclude Modules -exclude \*.tbd -strip-debug-symbols -strip-tool /Applications/ -resolve-src-symlinks /Users/ruud/Projects/audio/iPlug2/projects/NarlyDriver/build-mac/NarlyDriver.appex /Users/ruud/Applications/
error: /Users/ruud/Projects/audio/iPlug2/projects/NarlyDriver/build-mac/NarlyDriver.appex: No such file or directory (in target 'AUv3App' from project 'NarlyDriver-macOS')

On another note: I commented this line:

GCC_CFLAGS[arch=x86_64] = -Wno-write-strings -mfpmath=sse -msse -msse2 -msse3 //-mavx

Because leaving it enabled it would cause this error and not compile:

FIXME: Implement XCBuild support for macros in overriding parameters with condition sets:
GCC_CFLAGS[arch=x86_64] = -Wno-write-strings -mfpmath=sse -msse -msse2 -msse3

If you have any idea on where to start, or what info to post, please let me know!