/usr/include/interpolation/intlog.h is in libemos-dev 000382+dfsg-2.
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 | C
C Common block.
COMMON /INTLOGC/ LDEBUG
SAVE /INTLOGC/
LOGICAL LDEBUG
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