Added test for presence of the SDL headers.

configure

@@ -2046,48 +2046,6 @@ fi
 
 } # ac_fn_cxx_try_link
 
-# ac_fn_cxx_try_run LINENO
-# ------------------------
-# Try to link conftest.$ac_ext, and return whether this succeeded. Assumes
-# that executables *can* be run.
-ac_fn_cxx_try_run ()
-{
-  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  if { { ac_try="$ac_link"
-case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
-$as_echo "$ac_try_echo"; } >&5
-  (eval "$ac_link") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; } && { ac_try='./conftest$ac_exeext'
-  { { case "(($ac_try" in
-  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
-  *) ac_try_echo=$ac_try;;
-esac
-eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
-$as_echo "$ac_try_echo"; } >&5
-  (eval "$ac_try") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; }; then :
-  ac_retval=0
-else
-  $as_echo "$as_me: program exited with status $ac_status" >&5
-       $as_echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-       ac_retval=$ac_status
-fi
-  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
-  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
-  as_fn_set_status $ac_retval
-
-} # ac_fn_cxx_try_run
-
 # ac_fn_cxx_check_header_mongrel LINENO HEADER VAR INCLUDES
 # ---------------------------------------------------------
 # Tests whether HEADER exists, giving a warning if it cannot be compiled using
@@ -2175,6 +2133,48 @@ fi
 
 } # ac_fn_cxx_check_header_mongrel
 
+# ac_fn_cxx_try_run LINENO
+# ------------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded. Assumes
+# that executables *can* be run.
+ac_fn_cxx_try_run ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && { ac_try='./conftest$ac_exeext'
+  { { case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: program exited with status $ac_status" >&5
+       $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+       ac_retval=$ac_status
+fi
+  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  as_fn_set_status $ac_retval
+
+} # ac_fn_cxx_try_run
+
 # ac_fn_cxx_check_func LINENO FUNC VAR
 # ------------------------------------
 # Tests whether FUNC exists, setting the cache variable VAR accordingly
@@ -16028,6 +16028,41 @@ fi
 	fi
 
 
+# Check for SDL headers
+
+ac_fn_cxx_check_header_mongrel "$LINENO" "SDL/SDL.h" "ac_cv_header_SDL_SDL_h" "$ac_includes_default"
+if test "x$ac_cv_header_SDL_SDL_h" = x""yes; then :
+
+else
+  as_fn_error $? "Header not found. Install missing devel package." "$LINENO" 5
+fi
+
+
+ac_fn_cxx_check_header_mongrel "$LINENO" "SDL/SDL_mixer.h" "ac_cv_header_SDL_SDL_mixer_h" "$ac_includes_default"
+if test "x$ac_cv_header_SDL_SDL_mixer_h" = x""yes; then :
+
+else
+  as_fn_error $? "Header not found. Install missing devel package." "$LINENO" 5
+fi
+
+
+ac_fn_cxx_check_header_mongrel "$LINENO" "SDL/SDL_image.h" "ac_cv_header_SDL_SDL_image_h" "$ac_includes_default"
+if test "x$ac_cv_header_SDL_SDL_image_h" = x""yes; then :
+
+else
+  as_fn_error $? "Header not found. Install missing devel package." "$LINENO" 5
+fi
+
+
+ac_fn_cxx_check_header_mongrel "$LINENO" "SDL/SDL_ttf.h" "ac_cv_header_SDL_SDL_ttf_h" "$ac_includes_default"
+if test "x$ac_cv_header_SDL_SDL_ttf_h" = x""yes; then :
+
+else
+  as_fn_error $? "Header not found. Install missing devel package." "$LINENO" 5
+fi
+
+
+
 # Check for SDL libraries
 saved_LIBS=$LIBS
 # Extract the first word of "sdl-config", so it can be a program name with args.
@@ -16395,7 +16430,6 @@ FFMPEG_LIBS=`pkg-config --libs libavformat libswscale`
 LIBS=$saved_LIBS
 
 # Checks for header files.
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
 $as_echo_n "checking for ANSI C header files... " >&6; }
 if test "${ac_cv_header_stdc+set}" = set; then :

configure.ac

@@ -53,6 +53,12 @@ AX_BOOST_THREAD
 AX_BOOST_IOSTREAMS
 AX_BOOST_PROGRAM_OPTIONS
 
+# Check for SDL headers
+AC_CHECK_HEADER([SDL/SDL.h], [], [AC_MSG_ERROR([Header not found. Install missing devel package.])])
+AC_CHECK_HEADER([SDL/SDL_mixer.h], [], [AC_MSG_ERROR([Header not found. Install missing devel package.])])
+AC_CHECK_HEADER([SDL/SDL_image.h], [], [AC_MSG_ERROR([Header not found. Install missing devel package.])])
+AC_CHECK_HEADER([SDL/SDL_ttf.h], [], [AC_MSG_ERROR([Header not found. Install missing devel package.])])
+
 # Check for SDL libraries
 saved_LIBS=$LIBS
 AC_CHECK_PROG(HAVE_SDL_CONFIG, sdl-config, yes, no)