#!/bin/sh
+[ "${0%/*}" = "$0" ] || cd "${0%/*}" || exit
-find . -type d -name .deps | xargs rm -rf
-rm -rf config.guess config.sub ltmain.sh
-libtoolize --automake
-aclocal -I autoconf 2>/dev/null &&
-autoheader &&
-automake --add-missing --include-deps # 2>/dev/null &&
-autoconf
+# %reldir%/%canon_reldir% (%D%/%C%) only appeared in automake 1.14, but RHEL/CentOS 7 has 1.13.4
+# This is an (overly) simplistic preprocessor that papers around this for the duration of the generation step,
+# and can be removed once support for CentOS 7 is dropped
+automake --version | awk '{print $NF; exit}' | (
+ IFS=. read -r AM_MAJ AM_MIN _
+ [ "$AM_MAJ" -gt 1 ] || [ "$AM_MIN" -ge 14 ]
+) || {
+ process_root() {
+ root="$1"; shift
+ grep -q '%[CD]%' "$root/Makefile.am" || return
+ find "$root" -name Makefile.am "$@" | while read -r dir; do
+ dir="${dir%/Makefile.am}"
+ grep -q '%[CD]%' "$dir/Makefile.am" || continue
+
+ reldir="${dir#"$root"}"
+ reldir="${reldir#/}"
+
+ canon_reldir="$(printf '%s' "$reldir" | tr -C 'a-zA-Z0-9@_' '_')"
+
+ reldir_slash="$reldir/"
+ canon_reldir_slash="${canon_reldir}_"
+ [ -z "$reldir" ] && reldir_slash=
+ [ -z "$reldir" ] && canon_reldir_slash=
+
+ echo "$dir/Makefile.am" >&3
+ sed -i~ -e "s:%D%/:$reldir_slash:g" -e "s:%D%:$reldir:g" \
+ -e "s:%C%_:$canon_reldir_slash:g" -e "s:%C%:$canon_reldir:g" "$dir/Makefile.am"
+ done 3>>"$substituted_files"
+ }
+
+ rollback() {
+ while read -r f; do
+ mv "$f~" "$f"
+ done < "$substituted_files"
+ rm -f "$substituted_files"
+ }
+
+
+ echo "Automake <1.14; papering over missing %reldir%/%canon_reldir% support" >&2
+
+ substituted_files="$(mktemp)"
+ trap rollback EXIT
+
+ roots="$(sed '/Makefile$/!d;/module/d;s:^\s*:./:;s:/Makefile::;/^\.$/d' configure.ac)"
+
+ IFS="
+"
+ for root in $roots; do
+ root="${root#./}"
+ process_root "$root"
+ done
+
+ set -f
+ # shellcheck disable=SC2086,SC2046
+ process_root . $(printf '!\n-path\n%s/*\n' $roots)
+}
+
+autoreconf -fiv && rm -rf autom4te.cache