Simple logger/debug messages with levels in C

This snippet shows way to turning-on/-off different levels of log/debug messaging in C program:

For example, lets create log messages support with 3 levels and possibility to select what levels are enabled:

#define PRN(...) printf(__VA_ARGS__)
#define L1 1
#define L2 2
#define L3 4

#define PRN_L(L, ...) PRN_##L(__VA_ARGS__)

#if (LEVEL) & (L3)
#  define PRN_L3(...) PRN(__VA_ARGS__)
#else
#  define PRN_L3(...)
#endif

#if (LEVEL) & (L2)
#  define PRN_L2(...) PRN(__VA_ARGS__)
#else
#  define PRN_L2(...)
#endif

#if (LEVEL) & (L1)
#  define PRN_L1(...) PRN(__VA_ARGS__)
#else
#  define PRN_L1(...)
#endif

And somewhere in our program use it:

// enable only messages of levels 1 and 3 (equals to 1|4==5)
#define LEVEL (L1|L3)
#include "logger.h"

void main() {
    // use general macro or PRN_L1(), PRN_L2(), PRN_L3()
    PRN_L(L1, "There %d\n", 1);
    PRN_L(L2, "There %d\n", 2); // no effect!
    PRN_L(L3, "There %d\n", 3);
}

What else? With LEVEL definition you can control enabled levels: 0 - disable all levels or use OR-ed combination of L1..3