diff --git a/plotutils-libpng15.patch b/plotutils-libpng15.patch
new file mode 100644
index 0000000..e5269b0
--- /dev/null
+++ b/plotutils-libpng15.patch
@@ -0,0 +1,31 @@
+Index: plotutils-2.6/libplot/z_write.c
+===================================================================
+--- plotutils-2.6.orig/libplot/z_write.c
++++ plotutils-2.6/libplot/z_write.c
+@@ -164,7 +164,7 @@ _pl_z_maybe_output_image (S___(Plotter *
+     }
+ 
+   /* cleanup after libpng errors (error handler does a longjmp) */
+-  if (setjmp (png_ptr->jmpbuf))
++  if (setjmp (png_jmpbuf(png_ptr)))
+     {
+       png_destroy_write_struct (&png_ptr, (png_info **)NULL);
+       return -1;
+@@ -444,7 +444,7 @@ _our_error_fn_stdio (png_struct *png_ptr
+ #endif
+     }
+ 
+-  longjmp (png_ptr->jmpbuf, 1);
++  longjmp (png_jmpbuf(png_ptr), 1);
+ }
+ 
+ static void 
+@@ -515,7 +515,7 @@ _our_error_fn_stream (png_struct *png_pt
+ #endif
+     }
+ 
+-  longjmp (png_ptr->jmpbuf, 1);
++  longjmp (png_jmpbuf(png_ptr), 1);
+ }
+ 
+ static void 
diff --git a/plotutils.changes b/plotutils.changes
index 25f9564..d9a8176 100644
--- a/plotutils.changes
+++ b/plotutils.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Aug 29 12:39:58 UTC 2012 - pgajdos@suse.com
+
+- build also with libpng15
+  * libpng15.patch
+
 -------------------------------------------------------------------
 Mon Aug  6 13:20:52 UTC 2012 - pgajdos@suse.com
 
diff --git a/plotutils.spec b/plotutils.spec
index f2d0683..2e9fe98 100644
--- a/plotutils.spec
+++ b/plotutils.spec
@@ -37,6 +37,8 @@ Patch:          plotutils-man.patch
 Patch1:         plotutils-uninitialized.patch
 Patch2:         plotutils-dasharray-format.patch
 Patch3:         plotutils-autoreconf.patch
+# libpng15.patch sent 2012-08-30 at rsm@math.arizona.edu
+Patch4:         plotutils-libpng15.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
 %description
@@ -164,6 +166,7 @@ Authors:
 %patch1
 %patch2
 %patch3
+%patch4 -p1
 # Force update lex and bison code:
 grep -rslE '(made by GNU Bison|A Bison parser, made from|"lex.yy.c")' . | xargs -r rm -f