Index: Portfile
===================================================================
--- Portfile	(revision 36381)
+++ Portfile	(arbetskopia)
@@ -3,7 +3,7 @@
 PortSystem              1.0
 
 name                    libpng
-version                 1.2.26
+version                 1.2.28
 categories              graphics
 maintainers             ryandesign waqar@macports.org
 platforms               darwin openbsd freebsd sunos linux
@@ -25,13 +25,16 @@
     only supports C.  Support for other languages is being considered.
 
 checksums \
-    md5 1f743f4a3e5a9c12ea16eff0c60c3f8e \
-    sha1 f8a0c4631d24cd527e4ed9c1c233fb34c5f1d01e \
-    rmd160 c9aeb5afff2f3f61bc93b8e5b776110fcb80ad09
+    md5 c981a7014fc695e354d2f2cac3a6742e \
+    sha1 17ca5906a8c78a4c97631912e78aada8a2951891 \
+    rmd160 bb256a68fe178c4018d935d03aabe529d861a88e
 
 depends_lib \
-    port:zlib
+    port:zlib port:libtool port:autoconf port:automake
 
+pre-configure   { reinplace "s/libtoolize/glibtoolize/" "${worksrcpath}/autogen.sh"
+                  system "cd ${worksrcpath} && ./autogen.sh" }
+
 test.run                yes
 test.target             check