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diff --git a/site_scons/site_tools/Dia2Png.py b/site_scons/site_tools/Dia2Png.py
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+++ b/site_scons/site_tools/Dia2Png.py
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+## \file
+# \brief Dia2Png builder
+
+## \package senfscons.Dia2Png
+# \brief Build a PNG file from a DIA file
+#
+# This builder will convert a given DIA file into a PNG image. The
+# size of the target file is specified by giving a preferred DPI value
+# and a maximum width. The Builder will automatically fetch the
+# correct aspect ratio from the dia file.
+#
+# \par Construction Envrionment Variables:
+# <table class="senf">
+# <tr><td>\c DIACOM</td><td>dia command, defaults to \c dia</td></tr>
+# <tr><td>\c DIA2PNGDPI</td><td>resolution of converted image, defaults to 115</td></tr>
+# <tr><td>\c DIA2PNGMAXWIDTH</td><td>maximum image width, defaults to 800</td></tr>
+# </table>
+#
+# \ingroup builder
+
+import os
+import SCons.Builder, SCons.Action
+
+def dia_getSize(env,source):
+    size = None
+    for line in os.popen(env['DIACOM']+" -e /proc/self/fd/1 -t eps "+str(source[0]),"r"):
+        if line.startswith("%%BoundingBox:"):
+            size=map(int,line.split()[3:])
+            break
+    return size
+
+def dia2png_generator(source, target, env, for_signature):
+    if for_signature:
+        return "$DIACOM -t png -s $DIA2PNGDPI,$DIA2PNGMAXWIDTH $TARGET $SOURCE"
+    size = dia_getSize(env,source)
+    if not size: return None;
+    size[0] = size[0]*int(env['DIA2PNGDPI'])/72
+    size[1] = size[1]*int(env['DIA2PNGDPI'])/72
+    if size[0] > env['DIA2PNGMAXWIDTH']:
+        size[1] = size[1]*env['DIA2PNGMAXWIDTH']/size[0]
+        size[0] = env['DIA2PNGMAXWIDTH']
+    return SCons.Action.Action("$DIACOM -t png -s %dx%d -e $TARGET $SOURCE" % tuple(size))
+
+Dia2Png = SCons.Builder.Builder(suffix = ".png",
+                                src_suffix = ".dia",
+                                generator = dia2png_generator,
+                                single_source = 1)
+
+def generate(env):
+    env['BUILDERS']['Dia2Png'] = Dia2Png
+    env['DIACOM'] = "dia"
+    env['DIA2PNGDPI'] = 115
+    env['DIA2PNGMAXWIDTH'] = 800
+
+def exists(env):
+    return env.Detect("dia")