--- /var/abs/extra/libpng/PKGBUILD	2013-07-10 00:05:41.000000000 +0200
+++ PKGBUILD	2013-07-10 19:16:29.684690420 +0200
@@ -14,12 +14,14 @@ url="http://www.libpng.org/pub/png/libpn
 license=('custom')
 depends=('zlib' 'sh')
 options=('!libtool')
-source=("http://downloads.sourceforge.net/sourceforge/$pkgname/$pkgname-$pkgver.tar.xz"
+source=("http://downloads.sourceforge.net/sourceforge/${pkgname}/${pkgname}-${pkgver}.tar.xz"
+	"http://downloads.sourceforge.net/sourceforge/${pkgname}/${pkgname}-${pkgver}.tar.xz.asc"
         "http://downloads.sourceforge.net/sourceforge/libpng-apng/libpng-$_apngver-apng.patch.gz"
         0001-libpng16-Avoid-dereferencing-NULL-pointer-possibly-r.patch
         0002-libpng16-Calculate-our-own-zlib-windowBits-when-deco.patch
         adjust-apng-patch-for-libpng16-git-changes.patch)
 md5sums=('9d838f6fca9948a9f360a0cc1b516d5f'
+         'SKIP'
          '7d0c9f4b9a7f45dd5d1088e54b623c98'
          '59b83234f60a7d1d179d9b0b6a0ebc01'
          'b1f7922b6678305bdb7c23d5bd1763f3'