/usr/bin/regina-engine-config is in regina-normal 4.90-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | #!/bin/sh
#
# This script is based on gtk-config, whose documentation contains the
# following notice:
#
#   Copyright (C)  1998 Owen Taylor
#
#   Permission to use, copy, modify, and distribute this software and its
#   documentation for any purpose and without fee is hereby granted,
#   provided that the above copyright notice appear in all copies and that
#   both that copyright notice and this permission notice appear in
#   supporting documentation.
#
# Changes to this script were made by Ben Burton <bab@debian.org> and are
# licensed under the GNU General Public License.
prefix=/usr
exec_prefix=/usr
exec_prefix_set=no
usage()
{
	cat <<EOF
Usage: regina-engine-config [OPTIONS]
Options:
	[--prefix[=DIR]]
	[--exec-prefix[=DIR]]
	[--version]
	[--libs]
	[--cflags]
EOF
	exit $1
}
if test $# -eq 0; then
	usage 1 1>&2
fi
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
      if test $exec_prefix_set = no ; then
        exec_prefix=$optarg
      fi
      ;;
    --prefix)
      echo_prefix=yes
      ;;
    --exec-prefix=*)
      exec_prefix=$optarg
      exec_prefix_set=yes
      ;;
    --exec-prefix)
      echo_exec_prefix=yes
      ;;
    --version)
      echo 4.90
      ;;
    --cflags)
      echo_cflags=yes
      ;;
    --libs)
      echo_libs=yes
      ;;
    *)
      usage 1 1>&2
      ;;
  esac
  shift
done
if test "$echo_prefix" = "yes"; then
	echo $prefix
fi
if test "$echo_exec_prefix" = "yes"; then
	echo $exec_prefix
fi
regina_engine_libs="-lregina-engine  /usr/lib/libxml2.so /usr/lib/libgmp.so /usr/lib/x86_64-linux-gnu/libz.so -lpthread"
if test "$echo_cflags" = "yes"; then
	includes=" -I/usr/include -I/usr/include/libxml2"
	includes="-I/usr/include/regina-normal $includes"
	echo $includes
fi
if test "$echo_libs" = "yes"; then
	libdirs=-L/usr/lib
	my_regina_engine_libs=
	for i in $regina_engine_libs ; do
		if test "x$i" != "x-L/usr/lib" ; then
			if test -z "$my_regina_engine_libs" ; then
				my_regina_engine_libs="$i"
			else
				my_regina_engine_libs="$my_regina_engine_libs $i"
			fi
		fi
	done
	echo $libdirs $my_regina_engine_libs
fi
 |