aligned_alloc may not be supported: error: 'aligned_alloc' is not a member of 'std'; did you mean 'aligned_union'?

[barracuda156]

In file included from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/world/MADworld.h:46,
                 from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/tensor/elem.h:36,
                 from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/tensor/tensor_lapack.h:212,
                 from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/tensor/lapack.cc:55:
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/world/worldgop.h: In member function 'std::vector<T> madness::WorldGopInterface::concat0(const std::vector<T>&, size_t)':
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/world/worldgop.h:971:38: error: 'aligned_alloc' is not a member of 'std'; did you mean 'aligned_union'?
  971 |                                 std::aligned_alloc(sizeof(void *), bufsz)),
      |                                      ^~~~~~~~~~~~~
      |                                      aligned_union
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/world/worldgop.h:974:38: error: 'aligned_alloc' is not a member of 'std'; did you mean 'aligned_union'?
  974 |                                 std::aligned_alloc(sizeof(void *), bufsz)),
      |                                      ^~~~~~~~~~~~~
      |                                      aligned_union
In file included from /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/world/MADworld.h:47:
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/world/worlddc.h: In static member function 'static void madness::archive::ArchiveStoreImpl<madness::archive::ParallelOutputArchive<madness::archive::VectorOutputArchive>, madness::WorldContainer<keyT, valueT> >::store(const madness::archive::ParallelOutputArchive<madness::archive::VectorOutputArchive>&, const madness::WorldContainer<keyT, valueT>&)':
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/world/worlddc.h:1912:17: warning: there are no arguments to 'MPI_Gather' that depend on a template parameter, so a declaration of 'MPI_Gather' must be available [-fpermissive]
 1912 |                 MPI_Gather(&size, 1, MPI_INT, sizes.data(), 1, MPI_INT, 0, world->mpi.comm().Get_mpi_comm());
      |                 ^~~~~~~~~~
/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_science_madness/madness/work/madness-67ea7b5b533583ba7e0989cff91df738fda8b85b/src/madness/world/worlddc.h:1932:17: warning: there are no arguments to 'MPI_Gatherv' that depend on a template parameter, so a declaration of 'MPI_Gatherv' must be available [-fpermissive]
 1932 |                 MPI_Gatherv(buf, local_size, MPI_BYTE, all_data, sizes.data(), offsets.data(), MPI_BYTE, 0, world->mpi.comm().Get_mpi_comm());
      |                 ^~~~~~~~~~~
make[2]: *** [src/madness/tensor/CMakeFiles/MADlinalg-obj.dir/lapack.cc.o] Error 1
make[2]: *** Waiting for unfinished jobs....

The code should check for availability of aligned_alloc and fall back to posix_memalign or malloc.

[barracuda156]

Breakage apparently introduced by c7e2673 where in that spot the check for HAVE_POSIX_MEMALIGN was forgotten.

@EricaCMitchell @evaleev FYI