automake-1.11.diff

diff --git a/PKGBUILD b/PKGBUILD
index e94e51f..386635a 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -15,8 +15,14 @@ makedepends=('autoconf')
 provides=("automake=$pkgver")
 checkdepends=('dejagnu' 'python2' 'java-environment' 'vala' 'emacs' 'cscope')
 install=automake.install
-source=(ftp://ftp.gnu.org/gnu/${_realname}/${_realname}-${pkgver}.tar.xz)
-md5sums=('cf4752287ad708f83bd3689da57a32c9')
+source=(ftp://ftp.gnu.org/gnu/${_realname}/${_realname}-${pkgver}.tar.xz perl2.6.patch)
+md5sums=('cf4752287ad708f83bd3689da57a32c9'
+         'bae3eaea7e736cdc60fdab27eb70b357')
+
+prepare() {
+  cd ${srcdir}/${_realname}-${pkgver}
+  patch -p1 < ../perl2.6.patch
+}
 
 build() {
   cd ${srcdir}/${_realname}-${pkgver}
diff --git a/perl2.6.patch b/perl2.6.patch
new file mode 100644
index 0000000..5d15393
--- /dev/null
+++ b/perl2.6.patch
@@ -0,0 +1,12 @@
+diff -ru automake-1.11.6/automake.in automake-1.11.6-new/automake.in
+--- automake-1.11.6/automake.in	2012-07-09 08:39:57.000000000 -0700
++++ automake-1.11.6-new/automake.in	2017-06-06 11:20:30.047651821 -0700
+@@ -4156,7 +4156,7 @@
+ sub substitute_ac_subst_variables ($)
+ {
+   my ($text) = @_;
+-  $text =~ s/\${([^ \t=:+{}]+)}/&substitute_ac_subst_variables_worker ($1)/ge;
++  $text =~ s/\$[{]([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+   return $text;
+ }
+