It is safe to use these standard includes and their contents:
<tt/assert.h, conio.h, dio.h, errno.h, em.h, geos.h, joystick.h, modload.h, mouse.h, stdlib.h, string.h, tgi.h, time.h/
<p>
-For <tt/time.h/ functions <tt/systime()/ and <tt/clock/ note that the resolution is one second.
+For <tt/time.h/ functions <tt/systime()/ and <tt/clock()/ note that the resolution is one second.
<p>
It was not tested enough, but functions from these includes might work under GEOS:
<tt/rs232.h, zlib.h/