Simple update to the last stable version:
Index: Makefile
===================================================================
RCS file: /cvs/ports/graphics/png/Makefile,v
retrieving revision 1.120
diff -u -p -u -p -r1.120 Makefile
--- Makefile 15 Oct 2017 21:40:30 -0000 1.120
+++ Makefile 22 Oct 2017 09:36:07 -0000
@@ -2,7 +2,7 @@
COMMENT= library for manipulating PNG images
-VERSION= 1.6.32
+VERSION= 1.6.34
DISTNAME= libpng-${VERSION}
PKGNAME= png-${VERSION}
CATEGORIES= graphics
Index: distinfo
===================================================================
RCS file: /cvs/ports/graphics/png/distinfo,v
retrieving revision 1.57
diff -u -p -u -p -r1.57 distinfo
--- distinfo 15 Oct 2017 21:40:30 -0000 1.57
+++ distinfo 22 Oct 2017 09:36:07 -0000
@@ -1,2 +1,2 @@
-SHA256 (libpng-1.6.32.tar.xz) = yRjDET3nSmkvChUmzogdwmBndj6zkVxX7zoPe2iG9Zs=
-SIZE (libpng-1.6.32.tar.xz) = 997136
+SHA256 (libpng-1.6.34.tar.xz) = Lx6WDZLOOzq9A9Bt/sljffvSL+vxB6U2tE96R8YGWfY=
+SIZE (libpng-1.6.34.tar.xz) = 997968