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https://bugs.gentoo.org/775158
--- a/configure.ac
+++ b/configure.ac
@@ -11,7 +11,7 @@ AC_DEFINE_DIR(LOCALSTATEDIR, localstatedir)
dnl Perl stuff
AC_PATH_PROG([PERL], [perl])
eval `$PERL -V:startperl`
-if test "${startperl:0:1}" = "#" ; then
+if test "$(printf %.1s "$startperl")" = "#" ; then
startperl="\\$startperl"
fi
AC_SUBST(PERL_SHEBANG, $startperl)
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