AC_DEFUN([INVOKE_AG_MACROS_LAST],[
[if test X${INVOKE_AG_MACROS_LAST_done} != Xyes ; then]
GUILE_FLAGS
[ag_gv=$( exec 2>/dev/tty ; set -x
gdir=$(pkg-config --cflags-only-I guile-${GUILE_EFFECTIVE_VERSION})
gdir=$(echo ${gdir#-I})
gdir=$(awk '/SCM_MICRO_VERSION/{ print @S|@3 }' ${gdir}/libguile/version.h)
printf '%u%02u%03u' ${GUILE_EFFECTIVE_VERSION%\.*}
${GUILE_EFFECTIVE_VERSION#*\.} ${gdir}
)]
If I change that "@S|@" thingy to "$" it and the following "3" disappear. Why?
(And, yes, this fragment only works on recent POSIX shells.)
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