assignUser opened a new issue, #39590:
URL: https://github.com/apache/arrow/issues/39590
### Describe the bug, including details regarding any error messages,
version, and platform.
The externalProjects are run in a separate empty env, so any changes done to
prefix path (or other CMAKE_* vars) that we don't specifically pass on don't
reach the ep CMake.
I think this is a pretty rare edge case but it surfaced in the macOS R
submission. Ther runners have boost installed in a non-default prefix which is
passed on to CMake via envvar (I suspect, no direct access to the env) so our
`resolve_dependency` finds boost and uses that. But the sub-cmake of thrift
doesn't have the envvar to hint it boosts path and fails to find it.
We should forward `CMAKE_PREFIX_PATH` and `$ENV{CMAKE_PREFIX_PATH}` to the
external projects via `EP_COMMON_CMAKE_ARGS`. The envvar is (different then for
other vars) not used to initialize the cmake var, it is just used in
`find_package` so we have to forward it explicitly.
### Component(s)
C++
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