Integration tests fail when CPATH is not set

[ubaidsk]

/Users/ubaid/Desktop/OpenSource/lc/integration_tests/array_09.cpp:2:10: fatal error: 'xtensor/xtensor.hpp' file not found
#include <xtensor/xtensor.hpp>
         ^~~~~~~~~~~~~~~~~~~~~
LCOMPILERS_ASSERT failed: /Users/ubaid/Desktop/OpenSource/lc/src/libasr/../libasr/asr.h
function down_cast(), line number 40 at 
f != nullptr
/Users/ubaid/Desktop/OpenSource/lc/integration_tests/array_05.cpp:2:10: fatal error: 'xtensor/xfixed.hpp' file not found
#include <xtensor/xfixed.hpp>
         ^~~~~~~~~~~~~~~~~~~~
1 error generated.
Error while processing /Users/ubaid/Desktop/OpenSource/lc/integration_tests/array_05.cpp.
make[2]: *** [CMakeFiles/array_05.cpp.dir/build.make:74: array_05.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:312: CMakeFiles/array_05.cpp.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

After setting the CPATH as follows and running tests

$ CPATH=$CONDA_PREFIX/include:$CPATH ./integration_tests/run_tests.py -b llvm

The above issue works (it finds xtensor).

[certik]

I can reproduce this issue, it happens for me also.