I get the following warning compiling CVS HEAD:
[neilc:/Users/neilc/pgsql]% make -C src/backend/utils/error all
[ ... ]
gcc -no-cpp-precomp -O0 -Winline -fno-strict-aliasing -g -Wall
-Wmissing-prototypes -Wmissing-declarations -I../../../../src/include
-I/sw/include -c -o elog.o elog.c -MMD
elog.c: In function `log_line_prefix':
elog.c:1123: warning: passing arg 1 of `localtime' from incompatible
pointer type
This is on Mac OSX 10.3 w/ gcc 3.3
-Neil