> > Any luck with Midas in OS 10.15? 
> 
> Best I can tell, the problem is not in midas: pthread.h should be there, somewhere.
> 
> K.O.


HI Konstain, 

Thanks for your reply. I have been investigating this issue of pthread in OS 10.15.  Found this forum post 
https://github.com/wjakob/nori/issues/16

that seem to suggest that pthread.h is in a different directory from OS 10.14 and on. And the end of the post the 
developer suggests that he has found a way to fix the Cmake to work so I have checked his code updates in here 
https://github.com/wjakob/nori/commit/be46cccc01a75b21dad1a3f61baa108fe644fc4b

I have added his lines 


if(APPLE)
   # Try to auto-detect a suitable SDK
   execute_process(COMMAND bash -c "xcodebuild -version -sdk | grep MacOSX | grep Path | head -n 1 | cut -f 2 -
d ' '" OUTPUT_VARIABLE CMAKE_OSX_SYSROOT)
   string(REGEX REPLACE "(\r?\n)+$" "" CMAKE_OSX_SYSROOT "${CMAKE_OSX_SYSROOT}")
   string(REGEX REPLACE "^.*X([0-9.]*).sdk$" "\\1" CMAKE_OSX_DEPLOYMENT_TARGET 
"${CMAKE_OSX_SYSROOT}")
 endif()

to my local pakages/midas/CMakeLists.txt and run cmake .., make install again but now I get a different error 

[  1%] Building CXX object CMakeFiles/mfeo.dir/src/mfe.cxx.o
clang: error: invalid version number in '-mmacosx-version-
min=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/DriverKit19.0.sdk'
clang: warning: using sysroot for 'DriverKit' but targeting 'MacOSX' [-Wincompatible-sysroot]


I will continue investigating this issue tomorrow, but please let me know if you have any suggestions.

Also my version of cmake is 3.16.3

Thanks 

Berta