/usr/bin/gst-config is in libgst-dev 3.2.4-2.1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | #!/bin/sh
: ${prefix:=/usr}
: ${exec_prefix:=${prefix}}
: ${libdir:="${exec_prefix}/lib"}
: ${datarootdir:=${prefix}/share}
: ${pkglibdir:="${exec_prefix}/lib/gnu-smalltalk"}
: ${pkgdatadir:="${datarootdir}/gnu-smalltalk"}
: ${moduledir:="${pkglibdir}"}
exec_prefix_set=no
usage()
{
	cat <<EOF
Usage: gst-config [OPTIONS] [LIBRARIES]
Options:
	[--prefix[=DIR]]
	[--exec-prefix[=DIR]]
	[--version]
	[--libdir]
	[--datadir]
	[--libs]
	[--cflags]
Libraries:
	gst
EOF
	exit $1
}
if test $# -eq 0; then
	usage 1 1>&2
fi
lib_gtk=yes
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=$optarg
      exec_prefix_set=yes
      ;;
    --datadir)
      echo_datadir=yes
      ;;
    --libdir)
      echo_libdir=yes
      ;;
    --exec-prefix)
      echo_exec_prefix=yes
      ;;
    --help)
      usage 0
      ;;
    --version)
      echo 3.2.4
      ;;
    --cflags)
      echo_cflags=yes
      ;;
    --libs)
      echo_libs=yes
      ;;
    gst)
      lib_gst=yes
      ;;
    *)
      usage 1 1>&2
      ;;
  esac
  shift
done
gst_libs="-L${libdir} -lm "
if test "$echo_prefix" = "yes"; then
	echo $prefix
fi
if test "$echo_exec_prefix" = "yes"; then
	echo $exec_prefix
fi
if test "$echo_cflags" = "yes"; then
      my_cflags=
      test ${prefix}/include != /usr/include & my_cflags=-I${prefix}/include
      echo $my_cflags
fi
if test "$echo_libs" = "yes"; then
      my_gst_libs=-L${exec_prefix}/lib
      for i in $gst_libs ; do
	test $i != -L${exec_prefix}/lib && my_gst_libs="$my_gst_libs $i"
      done
      echo $my_gst_libs -lgst
fi      
if test "$echo_datadir" = "yes"; then
      echo $pkgdatadir
fi
if test "$echo_libdir" = "yes"; then
      echo $moduledir
fi
 |