readline does not compile anymore on HP-UX since d5f26b1287916c1790323965d46f5e0acad89155

[Osipov, Michael (LDA IT PLM)]

Folks,

> +if test -n "$want_auto_cflags" ; then
> +       AUTO_CFLAGS="-g ${GCC+-O2}"
> +       STYLE_CFLAGS="${GCC+-Wno-parentheses} ${GCC+-Wno-format-security}"
> +fi

This hunks seems not to be POSIX shell compliant. Both vars are set for 
me on HP-UX because the expansion is incomplete. According to [1] it has 
to be $(GCC:+..} and not $(GCC+..}. I have changed ./configure locally 
and it works with /bin/sh.

I assume that this should also work on any other POSIX compliant shell.

Michael

[1] 
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_02