-add_definitions("-D_BSD_SOURCE") # for htole32()
-add_definitions("-D_POSIX_C_SOURCE=199309L") # for nanosleep()
+add_definitions("-D_DEFAULT_SOURCE") # for htole32()
+add_definitions("-D_POSIX_C_SOURCE=200112L") # for nanosleep() and lroundf()
+
+# Express a preference for C99 format strings when using MinGW, see:
+# https://sourceforge.net/p/mingw-w64/wiki2/gnu%20printf/
+add_definitions("-D__USE_MINGW_ANSI_STDIO=1")