/usr/include/kerngen/iall1s.inc is in libkernlib1-dev 20061220+dfsg3-4.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | C set a word of all ones
#if defined(CERNLIB_QMDOS) && !defined(CERNLIB_QFMSOFT)
PARAMETER (IALL11 = NOT(0))
#else
PARAMETER (IALL11 = -1)
#endif
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