[build] fix MacOS X build: add ninja as req

* Print f2py:meson build logs in github actions
* add ninja as requirement

.github/workflows/build.yml

@@ -93,6 +93,11 @@ jobs:
         source $HOME/install/share/triqs/triqsvars.sh
         mkdir build && cd build && cmake ..
         make -j2 || make -j1 VERBOSE=1
+    
+    - name: Print logs
+      if: ${{ failure() }}
+      run: |
+        cat $(find . -name meson-log.txt)
 
     - name: Test app4triqs
       env:

python/triqs_dft_tools/converters/elktools/elkwrappers/CMakeLists.txt

@@ -12,7 +12,7 @@ add_custom_target(${module_name} ALL
 ##generate the fortran python wrapper shared library
 add_custom_command(
   OUTPUT ${generated_module_file}
-  COMMAND ${TRIQS_PYTHON_EXECUTABLE} -m numpy.f2py --f90exec=${CMAKE_Fortran_COMPILER} --f77exec=${CMAKE_Fortran_COMPILER} -c ${fortran_src_file} -m ${module_name} > elk_f2py.log
+  COMMAND ${TRIQS_PYTHON_EXECUTABLE} -m numpy.f2py --build-dir ${CMAKE_CURRENT_BINARY_DIR}/meson --f90exec=${CMAKE_Fortran_COMPILER} --f77exec=${CMAKE_Fortran_COMPILER} -c ${fortran_src_file} -m ${module_name} > elk_f2py.log
   WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
   )
 

requirements.txt

@@ -4,3 +4,4 @@ numpy
 scipy
 meson
 setuptools
+ninja