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Thanks for your reply! I did search unsuccessfully through the configure.ac file for references to the problematic fragment but if you feel that the source is in there somewhere, I will have a closer look.
The bug report doesn't contain enough info to reproduce the problem. That being said, most likely the problem is that the SANE project's configure.ac (or some .m4) file is underquoting. If so, it's not an Autoconf bug. See: https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.70/html_node/Balancing-Parentheses.html
A user of the SANE project has an issue with a generated configure script. A reference to the original conversation is here: https://gitlab.com/sane-project/backends/-/issues/468 They are running autoconf 2.71. Attached at the above bug report can be found their generated configure script. The issue seems to be related to the generation of this segment in a couple of places which has invalid syntax:
... for as_dir in $PATH do IFS=$as_save_IFS case $as_dir in #((( '' as_dir=./ ;; */) ;; *) as_dir=$as_dir/ ;; esac for ac_exec_ext in '' $ac_executable_extensions; do if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then ac_cv_prog_CC="${ac_tool_prefix}gcc" printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5 break 2 fi done ... IFS=$as_save_IFS
In other areas this segment has valid syntax:
... for as_dir in $PATH do IFS=$as_save_IFS case $as_dir in #((( '') as_dir=./ ;; */) ;; *) as_dir=$as_dir/ ;; esac for ac_exec_ext in '' $ac_executable_extensions; do if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then ac_cv_prog_CC="${ac_tool_prefix}cc" printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5 break 2 fi done ...
Any hints as to how we can track this down would be appreciated.
(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)
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