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/usr/include/interpolation/intlog.h is in libemos-dev 2:4.3.7-1.1.

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C
C Copyright 1981-2012 ECMWF.
C
C This software is licensed under the terms of the Apache Licence 
C Version 2.0 which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
C
C In applying this licence, ECMWF does not waive the privileges and immunities 
C granted to it by virtue of its status as an intergovernmental organisation 
C nor does it submit to any jurisdiction.
C
C     Common block.
      COMMON /INTLOGC/ LDEBUG
      SAVE /INTLOGC/
      LOGICAL LDEBUG