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2c811dd762
Currently, rrdtool1 produces the following build error
for various C files while building with GCC 15:
In file included from rrd_tool.h:93,
from rrd_cgi.c:11:
getopt.h:108:12: error: conflicting types for 'getopt'; have 'int(void)'
108 | extern int getopt ();
| ^~~~~~
In file included from include/fortify/unistd.h:22,
from rrd_tool.h:56:
include/unistd.h:127:5: note: previous declaration of 'getopt' with type 'int(int, char * const*, const char *)'
127 | int getopt(int, char * const [], const char *);
| ^~~~~~
This adds -std=gnu17 to TARGET_CFLAGS to fix the compilation error.
Signed-off-by: Til Kaiser <mail@tk154.de>