Polyspace Test xUnit tests fails to compile: fatal error: gtest/gtest.h

What parameter controls the C++ include file search path for my gtest test file?

Creating the project file with the python interface, I used (full python program listing attached):

buildConf.ExternalTestsBuildOptions.IncludePaths.add("/nix/store/pqyrsjax8n0wb4dxap66pf6ix6qdz34a-gtest-1.12.1-dev/include/")

This command attempts to build and run the test (mkproj.py attached):

python mkproj.py

That path does not seem to be included into the command line that compiles my test program:

### Building Polyspace Test xUnit tests
### Building for host
### Building 'testbin_sil'
### Using toolchain: GNU gcc/g++ | gmake (64-bit Linux)
...
g++ -c -fwrapv -fPIC -O0  -DPSTEST_BUILD -DPST_USER_CONFIG_FILE -DPST_MAX_NB_PARAMS=31 -I/home/dgeorge/ws/fsw_drivers/cadence_spi -I/home/dgeorge/ws/fsw_drivers/cadence_spi/include -I/nix/store/33r3mf9k7h9f81pybwbhkqzbf9cycg3s-polyspace-installation-R2024a/extern/include -I/nix/store/33r3mf9k7h9f81pybwbhkqzbf9cycg3s-polyspace-installation-R2024a/toolbox/polyspace/pstest/services/driver/host/c -I/nix/store/33r3mf9k7h9f81pybwbhkqzbf9cycg3s-polyspace-installation-R2024a/polyspace/pstest/pstunit/include -I/nix/store/33r3mf9k7h9f81pybwbhkqzbf9cycg3s-polyspace-installation-R2024a/polyspace/pstest/pstunit/src -o "pstunit.o" "/nix/store/33r3mf9k7h9f81pybwbhkqzbf9cycg3s-polyspace-installation-R2024a/polyspace/pstest/pstunit/src/pstunit.cpp"
/home/dgeorge/ws/fsw_drivers/cadence_spi/test_cadence_spi.cpp:6:10: fatal error: gtest/gtest.h: No such file or directory
    6 | #include <gtest/gtest.h>
      |          ^~~~~~~~~~~~~~

Invalid text character. Check for unsupported symbol, invisible character, or pasting of non-ASCII characters.

Project file snippet (project file attached):

      "ExternalTestsOptions": {
          "content": {
          "IncludePaths": {
          "content": {
          "IncludePaths": [
          {
          "content": {
          "Path": {
          "content": {
          "Value": "/nix/store/pqyrsjax8n0wb4dxap66pf6ix6qdz34a-gtest-1.12.1-dev/include"

Directory contents:

          $ ls /nix/store/pqyrsjax8n0wb4dxap66pf6ix6qdz34a-gtest-1.12.1-dev/include/gtest
gtest-assertion-result.h  gtest-matchers.h  gtest-param-test.h  gtest-spi.h        gtest-typed-test.h  gtest_pred_impl.h  internal
gtest-death-test.h        gtest-message.h   gtest-printers.h    gtest-test-part.h  gtest.h             gtest_prod.h

[Dan George]

The "workaround" is to put it into the plain buildConfig.IncludePaths. Perhaps this is not a workaround and is the proper placement.

What is the intended purpose of ExternalTestsBuildOptions?