/usr/lib/slepcdir/3.1/linux-gnu-c-opt/conf/slepcvariables is in libslepc3.1-dev 3.1-p6.dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | SLEPC_INSTALL_DIR =/usr/lib/slepcdir/3.1/linux-gnu-c-opt
SLEPC_HAVE_ARPACK = -DSLEPC_HAVE_ARPACK -DSLEPC_ARPACK_HAVE_UNDERSCORE
ARPACK_LIB = -L/usr/lib -lparpack -larpack
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