[OS X TeX] pdflatex reman error

[Peter Teeson]

Greetings:
(1) The environment:
     MacOS High Sierra 10.13.6; Xcode 10.1
     Doxygen 1.8.18; 
     Graphviz dot - graphviz version 2.45.20200705.1509 (20200705.1509);
     TeX 3.14159265 (TeX Live 2020)
      pdfTeX 3.14159265-2.6-1.40.21 (TeX Live 2020)

(2) Apple open source project: SampleUSBMIDIDriver.zip   <https://developer.apple.com/library/archive/samplecode/SampleUSBAudioOverrideDriver/Introduction/Intro.html#//apple_ref/doc/uid/DTS40009110 <https://developer.apple.com/library/archive/samplecode/SampleUSBAudioOverrideDriver/Introduction/Intro.html#//apple_ref/doc/uid/DTS40009110>>

TL:DNR
Downloaded and successfully built the project; 
Ran Doxygen - saved the log and the config; 
Gandalf:~ pteeson$ cd to the /SampleUSBMIDIDriver/Doxygen/latex directory
Gandalf:latex pteeson$ make
rm -f *.ps *.dvi *.aux *.toc *.idx *.ind *.ilg *.log *.out *.brf *.blg *.bbl refman.pdf
pdflatex refman

Got this error:

! Package inputenc Error: Invalid UTF-8 byte "B5.

See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.182 ...the number of bytes per microframe (125 ?
                                                  secs). If it is a full spe...

? H 
The document does not appear to be in UTF-8 encoding.
Try adding \UseRawInputEncoding as the first line of the file
or specify an encoding such as \usepackage [latin1]{inputenc}
in the document preamble.
Alternatively, save the file in UTF-8 using your editor or another tool
? 

(3) Saved the log and tracked the error down to some documentation in this header file
/System/Library/Frameworks/IOKitFramework//Headers/usb/IOUSBLib.h at line 1857:
"it will be the number of bytes per microframe (125 µsecs). If it is a full...”

(4) Checked the encoding of that file: 
Gandalf:~ pteeson$ file -I /System/Library/Frameworks/IOKit.framework/Versions/A/Headers/usb/IOUSBLib.h 
/System/Library/Frameworks/IOKit.framework/Versions/A/Headers/usb/IOUSBLib.h: text/html; charset=iso-8859-1


So What?
The character  µ (mu) 0xB5 is indeed not part of UTF-8! But it IS in ISO-8859-1- the documents encoding!!!!
So how could this happen? Where could the error be?  pdflatex? Doxygen?

I have saved both the Doxygen and pdflatex logs and can put them up as gists if anyone rwants to gory details.

Thanks for your suggestions…..

respect…

Peter
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