gnu: intltool: Fix a compatibility issue with Perl 5.26.0.

* gnu/packages/patches/intltool-perl-compatibility.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/glib.scm (intltool)[source]: Use it.

gnu/local.mk

@@ -682,6 +682,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/icu4c-reset-keyword-list-iterator.patch	\
   %D%/packages/patches/id3lib-CVE-2007-4460.patch			\
   %D%/packages/patches/ilmbase-fix-tests.patch			\
+  %D%/packages/patches/intltool-perl-compatibility.patch	\
   %D%/packages/patches/isl-0.11.1-aarch64-support.patch	\
   %D%/packages/patches/jbig2dec-ignore-testtest.patch		\
   %D%/packages/patches/jbig2dec-CVE-2016-9601.patch		\

gnu/packages/glib.scm

@@ -347,6 +347,7 @@ (define intltool
              (uri (string-append "https://launchpad.net/intltool/trunk/"
                                  version "/+download/intltool-"
                                  version ".tar.gz"))
+             (patches (search-patches "intltool-perl-compatibility.patch"))
              (sha256
               (base32
                "1karx4sb7bnm2j67q0q74hspkfn6lqprpy5r99vkn5bb36a4viv7"))))

gnu/packages/patches/intltool-perl-compatibility.patch

@@ -0,0 +1,76 @@
+This patch fixes a regex parsing compatibility issue with Perl 5.26.0.
+It manifests during the configure phase of at-spi2-core like this:
+
+------
+Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/^(.*)\${ <-- HERE ?([A-Z_]+)}?(.*)$/ at /gnu/store/...-intltool-0.51.0/bin/intltool-update line 1065.
+------
+
+Copied from Gentoo and MSYS2:
+
+https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-util/intltool/files/intltool-0.51.0-perl-5.26.patch?id=1105187fc65d8bf643e682fcef39620dcfd9326a
+https://github.com/Alexpux/MSYS2-packages/blob/0d3f442553ae4fc8798e32cbf44c4252fa8f3c07/intltool/perl-5.22-compatibility.patch
+
+#diff -ruN intltool-0.51.0.orig/intltool-update.in intltool-0.51.0/intltool-update.in
+#--- intltool-0.51.0.orig/intltool-update.in	2017-06-28 00:47:20.889269294 +0200
+#+++ intltool-0.51.0/intltool-update.in	2017-06-28 00:48:14.592271529 +0200
+#@@ -1068,7 +1068,7 @@
+# 	my $untouched = $1;
+# 	my $sub = "";
+#         # Ignore recursive definitions of variables
+#-        $sub = $varhash{$2} if defined $varhash{$2} and $varhash{$2} !~ /\${?$2}?/;
+#+        $sub = $varhash{$2} if defined $varhash{$2} and $varhash{$2} !~ /\$\{?$2}?/;
+# 
+# 	return SubstituteVariable ("$untouched$sub$rest");
+#     }
+--- intltool-0.51.0.orig/intltool-update.in	2015-03-09 02:39:54.000000000 +0100
++++ intltool-0.51.0.orig/intltool-update.in	2015-06-19 01:52:07.171228154 +0200
+@@ -1062,7 +1062,7 @@ 
+ 	}
+     }
+ 
+-    if ($str =~ /^(.*)\${?([A-Z_]+)}?(.*)$/)
++    if ($str =~ /^(.*)\$\{?([A-Z_]+)}?(.*)$/)
+     {
+ 	my $rest = $3;
+ 	my $untouched = $1;
+@@ -1068,7 +1068,7 @@
+ 	my $untouched = $1;
+ 	my $sub = "";
+         # Ignore recursive definitions of variables
+-        $sub = $varhash{$2} if defined $varhash{$2} and $varhash{$2} !~ /\${?$2}?/;
++        $sub = $varhash{$2} if defined $varhash{$2} and $varhash{$2} !~ /\$\{?$2}?/;
+ 
+ 	return SubstituteVariable ("$untouched$sub$rest");
+     }
+@@ -1190,10 +1190,10 @@ 
+ 	$name    =~ s/\(+$//g;
+ 	$version =~ s/\(+$//g;
+ 
+-	$varhash{"PACKAGE_NAME"} = $name if (not $name =~ /\${?AC_PACKAGE_NAME}?/);
+-	$varhash{"PACKAGE"} = $name if (not $name =~ /\${?PACKAGE}?/);
+-	$varhash{"PACKAGE_VERSION"} = $version if (not $name =~ /\${?AC_PACKAGE_VERSION}?/);
+-	$varhash{"VERSION"} = $version if (not $name =~ /\${?VERSION}?/);
++	$varhash{"PACKAGE_NAME"} = $name if (not $name =~ /\$\{?AC_PACKAGE_NAME}?/);
++	$varhash{"PACKAGE"} = $name if (not $name =~ /\$\{?PACKAGE}?/);
++	$varhash{"PACKAGE_VERSION"} = $version if (not $name =~ /\$\{?AC_PACKAGE_VERSION}?/);
++	$varhash{"VERSION"} = $version if (not $name =~ /\$\{?VERSION}?/);
+     }
+ 
+     if ($conf_source =~ /^AC_INIT\(([^,\)]+),([^,\)]+)[,]?([^,\)]+)?/m)
+@@ -1219,11 +1219,11 @@ 
+ 	$version =~ s/\(+$//g;
+         $bugurl  =~ s/\(+$//g if (defined $bugurl);
+ 
+-	$varhash{"PACKAGE_NAME"} = $name if (not $name =~ /\${?AC_PACKAGE_NAME}?/);
+-	$varhash{"PACKAGE"} = $name if (not $name =~ /\${?PACKAGE}?/);
+-	$varhash{"PACKAGE_VERSION"} = $version if (not $name =~ /\${?AC_PACKAGE_VERSION}?/);
+-	$varhash{"VERSION"} = $version if (not $name =~ /\${?VERSION}?/);
+-        $varhash{"PACKAGE_BUGREPORT"} = $bugurl if (defined $bugurl and not $bugurl =~ /\${?\w+}?/);
++	$varhash{"PACKAGE_NAME"} = $name if (not $name =~ /\$\{?AC_PACKAGE_NAME}?/);
++	$varhash{"PACKAGE"} = $name if (not $name =~ /\$\{?PACKAGE}?/);
++	$varhash{"PACKAGE_VERSION"} = $version if (not $name =~ /\$\{?AC_PACKAGE_VERSION}?/);
++	$varhash{"VERSION"} = $version if (not $name =~ /\$\{?VERSION}?/);
++        $varhash{"PACKAGE_BUGREPORT"} = $bugurl if (defined $bugurl and not $bugurl =~ /\$\{?\w+}?/);
+     }
+ 
+     # \s makes this not work, why?