/usr/bin/clamav-config is in libclamav-dev 0.99.4+addedllvm-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# Originally from libxml, Copyright (C) Daniel Veillard
prefix=/usr
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${prefix}/lib/x86_64-linux-gnu
usage()
{
    cat <<EOF
Usage: clamav-config [OPTION]
Known values for OPTION are:
  --prefix=DIR		change libclamav prefix [default $prefix]
  --libs		print library linking information
  --cflags		print pre-processor and compiler flags
  --help		display this help and exit
  --version		output version information
EOF
    exit $1
}
if test $# -eq 0; then
    usage 1
fi
cflags=false
libs=false
while test $# -gt 0; do
    case "$1" in
    -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
    *) optarg= ;;
    esac
    case "$1" in
    --prefix=*)
	prefix=$optarg
	;;
    --prefix)
	echo $prefix
	;;
    --version)
	echo 0.99.4
	exit 0
	;;
    --help)
	usage 0
	;;
    --cflags)
       	echo -I${prefix}/include -g -O2 -fdebug-prefix-map=/build/clamav-ETtCmt/clamav-0.99.4+addedllvm=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -D_FILE_OFFSET_BITS=64  -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
       	;;
    --libs)
       	echo -L${prefix}/lib/x86_64-linux-gnu  -lz -lbz2
       	;;
    *)
	usage
	exit 1
	;;
    esac
    shift
done
exit 0
 |