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$ freetype-config --cflags --libs
-I/usr/include/freetype2 -I/usr/include/libpng16 -lfreetype

$ pkg-config freetype2 --cflags --libs
-I/usr/include/freetype2 -I/usr/include/libpng16 -lfreetype

$ whereis freetype-config
freetype-config: /usr/bin/freetype-config /usr/share/man/man1/freetype-config.1.gz
$ cat /usr/bin/freetype-config
#! /bin/sh
#
# Copyright 2000-2017 by
# David Turner, Robert Wilhelm, and Werner Lemberg.
#
# This file is part of the FreeType project, and may only be used, modified,
# and distributed under the terms of the FreeType project license,
# LICENSE.TXT.  By continuing to use, modify, or distribute this file you
# indicate that you have read the license and understand and accept it
# fully.

LC_ALL=C
export LC_ALL


# if `pkg-config' is available, use values from `freetype2.pc'
/usr/bin/pkg-config --atleast-pkgconfig-version 0.24 >/dev/null 2>&1
if test $? -eq 0 ; then
  # note that option `--variable' is not affected by the
  # PKG_CONFIG_SYSROOT_DIR environment variable
  if test "x$SYSROOT" != "x" ; then
    PKG_CONFIG_SYSROOT_DIR="$SYSROOT"
    export PKG_CONFIG_SYSROOT_DIR
  fi

  prefix=`/usr/bin/pkg-config --variable prefix freetype2`
  exec_prefix=`/usr/bin/pkg-config --variable exec_prefix freetype2`

  includedir=`/usr/bin/pkg-config --variable includedir freetype2`
  libdir=`/usr/bin/pkg-config --variable libdir freetype2`

  version=`/usr/bin/pkg-config --modversion freetype2`

  cflags=`/usr/bin/pkg-config --cflags freetype2`
  dynamic_libs=`/usr/bin/pkg-config --libs freetype2`
  static_libs=`/usr/bin/pkg-config --static --libs freetype2`
else
  prefix="/usr"
  exec_prefix="/usr"

  includedir="/usr/include"

  version=21.0.15

  cflags="-I${SYSROOT}$includedir/freetype2"
  dynamic_libs="-lfreetype"
  static_libs="-lfreetype -lz -lpng16 -lm -lz -lm -lz"
fi

orig_prefix=$prefix
orig_exec_prefix=$exec_prefix

orig_includedir=$includedir

include_suffix=`echo $includedir | sed "s|$prefix||"`


usage()
{
  cat <<EOF
Usage: freetype-config [OPTION]...
Get FreeType compilation and linking information.

Options:
  --prefix               display \`--prefix' value used for building the
                         FreeType library
  --prefix=PREFIX        override \`--prefix' value with PREFIX
  --exec-prefix          display \`--exec-prefix' value used for building
                         the FreeType library
  --exec-prefix=EPREFIX  override \`--exec-prefix' value with EPREFIX
  --version              display libtool version of the FreeType library
  --ftversion            display FreeType version number
  --libs                 display flags for linking with the FreeType library
  --libtool              display library name for linking with libtool
  --cflags               display flags for compiling with the FreeType
                         library
  --static               make command line options display flags
                         for static linking
  --help                 display this help and exit
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
    local_prefix=yes
    ;;
  --prefix)
    echo_prefix=yes
    ;;
  --exec-prefix=*)
    exec_prefix=$optarg
    exec_prefix_set=yes
    local_prefix=yes
    ;;
  --exec-prefix)
    echo_exec_prefix=yes
    ;;
  --version)
    echo_version=yes
    break
    ;;
  --ftversion)
    echo_ft_version=yes
    ;;
  --cflags)
    echo_cflags=yes
    ;;
  --libs)
    echo_libs=yes
    ;;
  --libtool)
    echo 2>&1 "The use of libfreetype6.la is deprecated in Debian."
    exit 1
    ;;
  --static)
    show_static=yes
    ;;
  --help)
    usage 0
    ;;
  *)
    usage 1 1>&2
    ;;
  esac
  shift
done


if test "$local_prefix" = "yes" ; then
  if test "$exec_prefix_set" != "yes" ; then
    exec_prefix=$prefix
  fi
fi

if test "$local_prefix" = "yes" ; then
  includedir=${prefix}${include_suffix}
fi


if test "$echo_version" = "yes" ; then
  echo $version
fi

if test "$echo_prefix" = "yes" ; then
  echo ${SYSROOT}$prefix
fi

if test "$echo_exec_prefix" = "yes" ; then
  echo ${SYSROOT}$exec_prefix
fi

if test "$echo_ft_version" = "yes" ; then
  major=`grep define ${SYSROOT}$includedir/freetype2/freetype/freetype.h \
         | grep FREETYPE_MAJOR \
         | sed 's/.*[   ]\([0-9][0-9]*\).*/\1/'`
  minor=`grep define ${SYSROOT}$includedir/freetype2/freetype/freetype.h \
         | grep FREETYPE_MINOR \
         | sed 's/.*[   ]\([0-9][0-9]*\).*/\1/'`
  patch=`grep define ${SYSROOT}$includedir/freetype2/freetype/freetype.h \
         | grep FREETYPE_PATCH \
         | sed 's/.*[   ]\([0-9][0-9]*\).*/\1/'`
  echo $major.$minor.$patch
fi

if test "$echo_cflags" = "yes" ; then
  echo $cflags | sed "s|$orig_includedir/freetype2|$includedir/freetype2|"
fi

if test "$echo_libs" = "yes" ; then
  if test "$show_static" = "yes" ; then
    libs="$static_libs"
  else
    libs="$dynamic_libs"
  fi
  echo $libs
fi

# EOF