Bug#1139536: hypre: FTBFS: HYPRE_utilities.h:20:10: fatal error: mpi.h: No such file or directory

[Andreas Metzler]

On 2026-06-21 Graham Inggs <ginggs at debian.org> wrote:
> This may be related to the following change in debhelper 13.32.  See
> also #1139889 [1].

>  [ Helmut Grohne ]
>  * autoconf: export standard build tools


Yes it is related, if e.g. $CC is set ./configure will not search for
e.g. mpigcc.
if test "x$CC" = "x"
then
   hypre_user_chose_ccompilers=no
...


Also debian/rules only passes the first directory of "pkg-config
--cflags-only-I mpi" to --with-MPI-include and of top of that
AC_HYPRE_CHECK_MPI and AC_CHECK_FUNCS([MPI_Comm_f2c] ignore $MPIINCLUDE
which was set by --with-MPI-include.

cu Andreas
-- 
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I made the gesture of agreement.