BUILD: Check manually if the SDL2_image library is present

configure

@@ -18954,6 +18954,16 @@ $as_echo "#define LKT_NO_SQLITE3_HARD_HEAP_LIMIT64_FUNCTION /**/" >>confdefs.h
 fi
+pkg-config --exists SDL2_image 2>/dev/null 1>&2
+if test $? -ne 0 ; then
+    as_fn_error $? "unable to find the IMG_ReadXPMFromArray() function from the SDL2_image library" "$LINENO" 5
+else
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: Lib SDL2_image is present" >&5
+$as_echo "Lib SDL2_image is present" >&6; }
+    CFLAGS="`pkg-config --cflags SDL2_image` ${CFLAGS}"
+    LDFLAGS="`pkg-config --libs SDL2_image`"
+fi
+
 ################
 # CONF RESULTS #
 ################

configure.ac

@@ -441,6 +441,15 @@ AC_CHECK_LIB([sqlite3], [sqlite3_hard_heap_limit64], [
     AC_DEFINE([LKT_NO_SQLITE3_HARD_HEAP_LIMIT64_FUNCTION], [], [No hard heap limit for sqlite3])
 ])
 
+pkg-config --exists SDL2_image 2>/dev/null 1>&2
+if test $? -ne 0 ; then
+    AC_MSG_ERROR([unable to find the IMG_ReadXPMFromArray() function from the SDL2_image library])
+else
+    AC_MSG_RESULT(Lib SDL2_image is present)
+    CFLAGS="`pkg-config --cflags SDL2_image` ${CFLAGS}"
+    LDFLAGS="`pkg-config --libs SDL2_image`"
+fi
+
 ################
 # CONF RESULTS #
 ################