Optionally install the header files for API, and generated targets and header files for SDK at custom/default install location.

[zx8086]

custom/default install location?

For what ? the build, the system ?

example ?

[owent]

If you ares using cmake, you can set CMAKE_INSTALL_PREFIX to specify where to install all headers and library files.
If you are using bazel, there is no need to install or using cmake --install <build dir> --prefix <where to install>, because all headers are auto copied by deps

[zx8086]

I'm trying to instrument nginx via https://github.com/open-telemetry/opentelemetry-cpp-contrib/tree/main/instrumentation/nginx ...

Not sure what the locations should be for this given the errors are relating to missing headers.

[owent]

cmake --install . --prefix=<installation path> is better way. I have replied to open-telemetry/opentelemetry-cpp-contrib#146

[lalitb]

@zx8086 - Should be good to close this issue ?

[zx8086]

Good to close thanks @lalitb