Add comment on missing posix_memalign
@@ -947,6 +947,10 @@ buffer:
src/runtime/emitter.c src/runtime/builder.c \
-o monster_example
+NOTE: on some gcc platforms it may be necessary to use -std=gnu99 or -std=gnu11
+if the linker is unable find `posix_memalign`, see also comments in
+`include/portable/paligned_alloc.h`
+
Other features such as the verifier and the JSON printer and parser
would each need a different file in src/runtime. Which file should be
obvious from the filenames except that JSON parsing also requires the
