implicit declaration of function 'nanosleep'

[waterbug]

Compilation error:

gcc -std=c11 -g -O0 -fpic -Wall -Wshadow -Wno-deprecated -Wno-unused-variable -Wno-unused-but-set-variable -Wno-stringop-overread -I /usr/include/GL/ -I ./Include/ -I ./Kit/Include/ -I ./Kit/Source/ -D ENABLE_GUI -D USE_GLUT -D USE_SHADERS -c ./Source/42exec.c -o ./Object/42exec.o
./Source/42exec.c: In function 'AdvanceTime':
./Source/42exec.c:117:13: error: implicit declaration of function 'nanosleep' [-Wimplicit-function-declaration]
117 | nanosleep(&SleepDuration,NULL);
| ^~~~~~~~~
make: *** [Makefile:259: Object/42exec.o] Error 1

[waterbug]

Putting
"#define _POSIX_C_SOURCE 199309L"
at the top of Source/42exec.c fixed it.
(... result of asking Claude about it ... he had other ideas, too, but that was the simplest fix.)

[ericstoneking]

Okay, let me throw this one to the collective wisdom. IIRC, I replaced "microsleep" with "nanosleep" and added "-std=c11" to fix deprecation warnings that someone's compiler was throwing. It is always my intent to make 42 be as portable as reasonably possible, so I seriously don't want to trade one compiler version issue for another. This "199309L" looks very specific to me. Is there a "-std=foo" that y'all can agree on so that I can quit outguessing compilers and go back to doing dynamics?

Thanks,
-Eric