sdl2_ttf: requires automake 1.13.x.

media-libs/sdl2_ttf/sdl2_ttf-2.0.12.recipe

@@ -45,8 +45,8 @@ BUILD_REQUIRES="
 
 BUILD_PREREQUIRES="
 	cmd:libtoolize
-	cmd:aclocal
-	cmd:automake
+	cmd:aclocal_1.13
+	cmd:automake_1.13
 	cmd:autoconf
 	cmd:gcc$secondaryArchSuffix
 	cmd:ld$secondaryArchSuffix
@@ -57,9 +57,11 @@ SOURCE_DIR="SDL2_ttf-$portVersion"
 
 BUILD()
 {
+	touch INSTALL NEWS README AUTHORS ChangeLog COPYING
 	libtoolize --copy --force --install
-	aclocal --install -I acinclude
+	aclocal-1.13 --install -I acinclude
 	autoconf
+	automake-1.13
 	runConfigure ./configure --with-x=no
 	make $jobArgs
 }