pexec fails to cross build from source, because it uses help2man. Given
that pexec has very little dependencies, we can add a native build pass
for generating the manual page before performing the cross build. Please
consider applying the attached patch.

Helmut

[Helmut Grohne 2021-01-28]

I suspect a better fix is to convert the package to use 'dh' first.  I
tried the trivial conversion but it did not work because the configure
script do not understand --runstatedir=/run.

I just converted the packaging to git and made it available in
<URL: https://salsa.debian.org/debian/pexec > if you want to update the
package yourself.