rok opened a new issue, #50316:
URL: https://github.com/apache/arrow/issues/50316
### Describe the bug, including details regarding any error messages,
version, and platform.
The nightly `test-debian-experimental-cpp-gcc-15` job is failing during the
C++ build on Debian experimental with GCC 15.
```bash
[1831/2553] Building CXX object
src/arrow/CMakeFiles/arrow_testing_objlib.dir/testing/process.cc.o
FAILED: [code=1]
src/arrow/CMakeFiles/arrow_testing_objlib.dir/testing/process.cc.o
/usr/local/bin/sccache /usr/lib/ccache/g++-15 -DARROW_HAVE_RUNTIME_AVX2
-DARROW_HAVE_RUNTIME_AVX512 -DARROW_HAVE_RUNTIME_BMI2
-DARROW_HAVE_RUNTIME_SSE4_2 -DARROW_HAVE_SSE4_2 -DARROW_TESTING_EXPORTING
-DARROW_WITH_TIMING_TESTS -DBOOST_ATOMIC_DYN_LINK -DBOOST_ATOMIC_NO_LIB
-DBOOST_FILESYSTEM_DYN_LINK -DBOOST_FILESYSTEM_NO_LIB -DBOOST_PROCESS_HAVE_V2
-DBOOST_PROCESS_NEED_SOURCE -DBOOST_PROCESS_USE_V2 -I/build/cpp/src
-I/arrow/cpp/src -isystem /arrow/cpp/thirdparty/flatbuffers/include
-Wredundant-move -Wno-noexcept-type -Wno-self-move -fdiagnostics-color=always
-Wall -Wno-conversion -Wno-sign-conversion -Wdate-time -Wimplicit-fallthrough
-Wunused-result -fno-semantic-interposition -msse4.2 -g -Werror -O0 -ggdb -g1
-std=c++20 -fPIC -Wmissing-declarations -DGTEST_HAS_PTHREAD=1 -MD -MT
src/arrow/CMakeFiles/arrow_testing_objlib.dir/testing/process.cc.o -MF
src/arrow/CMakeFiles/arrow_testing_objlib.dir/testing/process.cc.o.d -o
src/arrow/CMakeFiles/arrow_testing_objlib.dir/testing/proce
ss.cc.o -c /arrow/cpp/src/arrow/testing/process.cc
/arrow/cpp/src/arrow/testing/process.cc:42:16: fatal error:
boost/process/v2/src.hpp: No such file or directory
42 | # include <boost/process/v2/src.hpp>
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
```
The build defines:
```text
-DBOOST_PROCESS_HAVE_V2
-DBOOST_PROCESS_NEED_SOURCE
-DBOOST_PROCESS_USE_V2
```
but the system Boost installation does not provide boost/process/v2/src.hpp.
https://github.com/apache/arrow/blob/7ebe6e9a62f9f22abe0b5c79013c40649bc77a5c/cpp/src/arrow/testing/process.cc#L35-L44
### Component(s)
Continuous Integration, C++
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