remove dependency on pkg-config

let's just assume the SDL2 library is called libSDL2 and can be linked against

Signed-off-by: Martin Kepplinger <martink@posteo.de>

configure.ac

@@ -175,9 +175,7 @@ AC_ARG_WITH(sdl2,
 AM_CONDITIONAL(SDL, test x"$with_sdl2" = "xyes")
 AS_IF([test "x$with_sdl2" = "xyes"], [
   AC_DEFINE(HAVE_SDL2,,[Use SDL2.])
-  PKG_CHECK_MODULES([SDL2], [sdl2], [], [
-    AC_CHECK_LIB([SDL2], [SDL_Init], [], [exit 1])
-  ])
+  AC_CHECK_LIB([SDL2], [SDL_Init], [], [exit 1])
 ])
 
 # libts Library versioning

tests/Makefile.am

@@ -53,7 +53,7 @@ endif
 
 if SDL
 ts_test_mt_SOURCES	= ts_test_mt_sdl.c sdlutils.c sdlutils.h
-ts_test_mt_LDADD	= $(top_builddir)/src/libts.la @SDL2_LIBS@
+ts_test_mt_LDADD	= $(top_builddir)/src/libts.la -lSDL2
 else
 ts_test_mt_SOURCES	= ts_test_mt.c testutils.c testutils.h fbutils.h font_8x8.c font_8x16.c font.h
 ts_test_mt_LDADD	= $(top_builddir)/src/libts.la
@@ -78,7 +78,7 @@ ts_print_raw_LDADD	= $(top_builddir)/src/libts.la
 
 if SDL
 ts_calibrate_SOURCES	= ts_calibrate_sdl.c ts_calibrate.h ts_calibrate_common.c sdlutils.c sdlutils.h
-ts_calibrate_LDADD	= $(top_builddir)/src/libts.la @SDL2_LIBS@
+ts_calibrate_LDADD	= $(top_builddir)/src/libts.la -lSDL2
 else
 ts_calibrate_SOURCES	= ts_calibrate.c ts_calibrate.h ts_calibrate_common.c fbutils.h testutils.c testutils.h font_8x8.c font_8x16.c font.h
 ts_calibrate_LDADD	= $(top_builddir)/src/libts.la