scipy: BLD: meson build failure - missing `xsimd.hpp`

Describe your issue.

Using environment_meson.yml. Ubuntu: 20.4 python 3.10 Conda: 4.11.0

Build fails with missing hpp file
python dev.py --build-only

In file included from scipy/stats/_hypotests_pythran.cpp:24:
/home/eduardo/miniconda3/envs/scipy-meson/lib/python3.10/site-packages/pythran/pythonic/include/numpy/ceil.hpp:8:10: fatal error: xsimd/xsimd.hpp: No such file or directory
    8 | #include <xsimd/xsimd.hpp>

I noticed the compilation command includes: -I"${CONDA_PREFIX}"/include/python3.10 but the xsimd files are located at ${CONDA_PREFIX}"/include (notice the path on command has an extra python3.10 in path).

Reproducing Code Example

python dev.py --build-only                             (scipy-meson) 
The Meson build system
Version: 0.61.2
Source dir: /home/eduardo/work/scipy/scipy-doit
Build dir: /home/eduardo/work/scipy/scipy-doit/build
Build type: native build
Project name: SciPy
Project version: 1.9.0.dev0
C compiler for the host machine: cc (gcc 9.4.0 "cc (GCC) 9.4.0")
C linker for the host machine: cc ld.bfd 2.36.1
C++ compiler for the host machine: c++ (gcc 9.4.0 "c++ (GCC) 9.4.0")
C++ linker for the host machine: c++ ld.bfd 2.36.1
Host machine cpu family: x86_64
Host machine cpu: x86_64
Compiler for C supports arguments -Wno-unused-but-set-variable: YES 
Library m found: YES
Fortran compiler for the host machine: gfortran (gcc 9.4.0 "GNU Fortran (GCC) 9.4.0")
Fortran linker for the host machine: gfortran ld.bfd 2.36.1
Program cython found: YES (/home/eduardo/miniconda3/envs/scipy-meson/bin/cython)
Program pythran found: YES (/home/eduardo/miniconda3/envs/scipy-meson/bin/pythran)
Program cp found: YES (/usr/bin/cp)
Program python3 found: YES (/home/eduardo/miniconda3/envs/scipy-meson/bin/python3.10)
WARNING: Python files installed by Meson might not be found by python interpreter.
 This warning can be avoided by setting "python.platlibdir" option.
WARNING: Python files installed by Meson might not be found by python interpreter.
 This warning can be avoided by setting "python.purelibdir" option.
Found pkg-config: /home/eduardo/miniconda3/envs/scipy-meson/bin/pkg-config (0.29.2)
Library npymath found: YES
Library npyrandom found: YES
Run-time dependency openblas found: YES 0.3.18
Dependency openblas found: YES 0.3.18 (cached)
Program _build_utils/cythoner.py found: YES (/home/eduardo/miniconda3/envs/scipy-meson/bin/python3.10 /home/eduardo/work/scipy/scipy-doit/scipy/_build_utils/cythoner.py)
Checking for function "open_memstream" : NO 
Configuring messagestream_config.h using configuration
Compiler for C++ supports arguments -fvisibility=hidden: YES 
Checking for size of "void*" : 8
Run-time dependency threads found: YES
Checking for size of "void*" : 8
Dependency threads found: YES unknown (cached)
Compiler for C++ supports arguments -fvisibility=hidden: YES (cached)
Compiler for C supports arguments -Wno-unused-but-set-variable: YES (cached)
Compiler for C supports arguments -Wno-unused-but-set-variable: YES (cached)
Compiler for C++ supports arguments -Wno-format-truncation: YES 
Compiler for C++ supports arguments -Wno-class-memaccess: YES 
Build targets in project: 196

SciPy 1.9.0.dev0

  User defined options
    prefix: /home/eduardo/work/scipy/scipy-doit/build-install

Error message

Meson build setup OK
ninja: Entering directory `build'
[794/1557] Compiling C++ object scipy/stats/_h....p/meson-generated_..__hypotests_pythran.cpp.o
FAILED: scipy/stats/_hypotests_pythran.cpython-310-x86_64-linux-gnu.so.p/meson-generated_..__hypotests_pythran.cpp.o 
c++ -Iscipy/stats/_hypotests_pythran.cpython-310-x86_64-linux-gnu.so.p -Iscipy/stats -I../scipy/stats -I/home/eduardo/miniconda3/envs/scipy-meson/lib/python3.10/site-packages/pythran -I/home/eduardo/miniconda3/envs/scipy-meson/lib/python3.10/site-packages/numpy/core/include -I/home/eduardo/miniconda3/envs/scipy-meson/include/python3.10 -fdiagnostics-color=always -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++14 -O2 -g -fPIC -Wno-unused-function -Wno-unused-variable -Wno-deprecated-declarations -Wno-int-in-bool-context -DENABLE_PYTHON_MODULE -D__PYTHRAN__=3 -DPYTHRAN_BLAS_NONE -MD -MQ scipy/stats/_hypotests_pythran.cpython-310-x86_64-linux-gnu.so.p/meson-generated_..__hypotests_pythran.cpp.o -MF scipy/stats/_hypotests_pythran.cpython-310-x86_64-linux-gnu.so.p/meson-generated_..__hypotests_pythran.cpp.o.d -o scipy/stats/_hypotests_pythran.cpython-310-x86_64-linux-gnu.so.p/meson-generated_..__hypotests_pythran.cpp.o -c scipy/stats/_hypotests_pythran.cpp
In file included from scipy/stats/_hypotests_pythran.cpp:24:
/home/eduardo/miniconda3/envs/scipy-meson/lib/python3.10/site-packages/pythran/pythonic/include/numpy/ceil.hpp:8:10: fatal error: xsimd/xsimd.hpp: No such file or directory
    8 | #include <xsimd/xsimd.hpp>
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.
[803/1557] Compiling C++ object scipy/sparse/s...ls.cpython-310-x86_64-linux-gnu.so.p/bsr.cxx.o
ninja: build stopped: subcommand failed.
Build failed!

SciPy/NumPy/Python version information

(1.9.0.dev0’, ‘1.22.2’, sys.version_info(major=3, minor=10, micro=2, releaselevel=‘final’, serial=0)