Description: <short summary of the patch>
 TODO: Put a short summary on the line above and replace this paragraph
 with a longer explanation of this change. Complete the meta-information
 with other relevant fields (see below for details). To make it easier, the
 information below has been extracted from the changelog. Adjust it or drop
 it.
 .
 grafx2 (2.5-1) unstable; urgency=medium
 .
   * New upstream version.
   * Bump standards version to 4.2.1.
   * debian/watch: updated.
   * debian/README.source: added.
Author: Gürkan Myczko <gurkan@phys.ethz.ch>

---
The information above should follow the Patch Tagging Guidelines, please
checkout http://dep.debian.net/deps/dep3/ to learn about the format. Here
are templates for supplementary fields that you might want to add:

Origin: <vendor|upstream|other>, <url of original patch>
Bug: <url in upstream bugtracker>
Bug-Debian: https://bugs.debian.org/<bugnumber>
Bug-Ubuntu: https://launchpad.net/bugs/<bugnumber>
Forwarded: <no|not-needed|url proving that it has been forwarded>
Reviewed-By: <name and email of someone who approved the patch>
Last-Update: 2018-10-13

--- grafx2-2.5.orig/src/Makefile
+++ grafx2-2.5/src/Makefile
@@ -22,6 +22,8 @@
 #  You should have received a copy of the GNU General Public License
 #  along with Grafx2; if not, see <http://www.gnu.org/licenses/>
 
+API ?= sdl2
+
 # Overridable defaults
   prefix = /usr
   exec_prefix = $(prefix)
