Mention RSVG dependency when creating the disk image on OSX

configure.ac

@@ -353,6 +353,7 @@ case $host in
            AC_PATH_TOOL([INSTALLNAMETOOL], [install_name_tool], install_name_tool)
            AC_PATH_TOOL([OTOOL], [otool], otool)
            AC_PATH_PROGS([GENISOIMAGE], [genisoimage mkisofs],genisoimage)
+           AC_PATH_PROGS([RSVG_CONVERT], [rsvg-convert rsvg],rsvg-convert)
            AC_PATH_PROGS([IMAGEMAGICK_CONVERT], [convert],convert)
            AC_PATH_PROGS([TIFFCP], [tiffcp],tiffcp)
 

doc/build-osx.md

@@ -18,6 +18,10 @@ Dependencies
 
     brew install automake berkeley-db4 libtool boost --c++11 miniupnpc openssl pkg-config homebrew/versions/protobuf260 --c++11 qt5 libevent
 
+In case you want to build the disk image with `make deploy` (.dmg / optional), you need RSVG
+
+    brew install librsvg
+
 NOTE: Building with Qt4 is still supported, however, could result in a broken UI. Building with Qt5 is recommended.
 
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