eqpg doesn't like bit fields

I get the following error from ecpg when it encounters a structure
containing a bit field:

../../include/ecn_types.h:317: ERROR: syntax error at or near ":"

The source it is complaining about is:

176 typedef enum {
177 tifIOC = 0,
178 tifDay = 1,
179 tifGTX = 2,
180 tifGTC = 3
181 } TIF_e;
...
316 typedef struct {
=> 317 TIF_e tif :4;
318 boolean_t isCoreOnly :1;
...

Does PostgreSQL support C-language bit fields? I tried searching the
archives, but could not find anything helpful.

Thanks,
Bob Noble