C code can test ABI version with this macro.

Signed-off-by: Fam Zheng <f...@redhat.com>
---
 configure | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure b/configure
index 879324b..e04e59f 100755
--- a/configure
+++ b/configure
@@ -5069,6 +5069,10 @@ if test "$sdl" = "yes" ; then
   echo "CONFIG_SDLABI=$sdlabi" >> $config_host_mak
   echo "SDL_CFLAGS=$sdl_cflags" >> $config_host_mak
 fi
+if test "$sdlabi" = "2.0"; then
+  echo "CONFIG_SDL2=y" >> $config_host_mak
+fi
+
 if test "$cocoa" = "yes" ; then
   echo "CONFIG_COCOA=y" >> $config_host_mak
 fi
-- 
2.7.4


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