found_snappy="no"
found_zlib="no"
bundled_zlib="no"
found_zstd="no"

PKG_CHECK_MODULES([PHP_MONGODB_SNAPPY],[snappy],[
  PHP_MONGODB_BUNDLED_CFLAGS="$PHP_MONGODB_BUNDLED_CFLAGS $PHP_MONGODB_SNAPPY_CFLAGS"
  PHP_EVAL_LIBLINE([$PHP_MONGODB_SNAPPY_LIBS],[MONGODB_SHARED_LIBADD])
  found_snappy="yes"
],[
  PHP_CHECK_LIBRARY([snappy],
                    [snappy_uncompress],
                    [have_snappy_lib="yes"],
                    [have_snappy_lib="no"])

  AC_CHECK_HEADER([snappy-c.h],
                  [have_snappy_headers=yes],
                  [have_snappy_headers=no])

  if test "$have_snappy_lib" = "yes" -a "$have_snappy_headers" = "yes"; then
    PHP_ADD_LIBRARY([snappy],,[MONGODB_SHARED_LIBADD])
    found_snappy="yes"
  fi
])

PKG_CHECK_MODULES([PHP_MONGODB_ZLIB],[zlib],[
  PHP_MONGODB_BUNDLED_CFLAGS="$PHP_MONGODB_BUNDLED_CFLAGS $PHP_MONGODB_ZLIB_CFLAGS"
  PHP_EVAL_LIBLINE([$PHP_MONGODB_ZLIB_LIBS],[MONGODB_SHARED_LIBADD])
  found_zlib="yes"
],[
  PHP_CHECK_LIBRARY([zlib],
                    [compress2],
                    [have_zlib_lib="yes"],
                    [have_zlib_lib="no"])

  AC_CHECK_HEADER([zlib.h],
                  [have_zlib_headers=yes],
                  [have_zlib_headers=no])

  if test "$have_zlib_lib" = "yes" -a "$have_zlib_headers" = "yes"; then
    PHP_ADD_LIBRARY([z],,[MONGODB_SHARED_LIBADD])
    found_zlib="yes"
  fi
])

dnl If zlib was not found, use libmongoc's bundled version
AS_IF([test "$found_zlib" != "yes"],[
  AC_CHECK_HEADER([unistd.h],[PHP_MONGODB_ZLIB_CFLAGS="$PHP_MONGODB_ZLIB_CFLAGS -DHAVE_UNISTD_H"])
  AC_CHECK_HEADER([stdarg.h],[PHP_MONGODB_ZLIB_CFLAGS="$PHP_MONGODB_ZLIB_CFLAGS -DHAVE_STDARG_H"])
  bundled_zlib="yes"
])

PKG_CHECK_MODULES([PHP_MONGODB_ZSTD],[libzstd],[
  PHP_MONGODB_BUNDLED_CFLAGS="$PHP_MONGODB_BUNDLED_CFLAGS $PHP_MONGODB_ZSTD_CFLAGS"
  PHP_EVAL_LIBLINE([$PHP_MONGODB_ZSTD_LIBS],[MONGODB_SHARED_LIBADD])
  found_zstd="yes"
],[
  PHP_CHECK_LIBRARY([zstd],
                    [ZSTD_compress],
                    [have_zstd_lib="yes"],
                    [have_zstd_lib="no"])

  AC_CHECK_HEADER([zstd.h],
                  [have_zstd_headers=yes],
                  [have_zstd_headers=no])

  if test "$have_zstd_lib" = "yes" -a "$have_zstd_headers" = "yes"; then
    PHP_ADD_LIBRARY([zstd],,[MONGODB_SHARED_LIBADD])
    found_zstd="yes"
  fi
])

if test "$found_snappy" = "yes" -o "$found_zlib" = "yes" -o "$bundled_zlib" = "yes" -o "$found_zstd" = "yes"; then
  AC_SUBST(MONGOC_ENABLE_COMPRESSION, 1)
  if test "$found_snappy" = "yes"; then
    AC_SUBST(MONGOC_ENABLE_COMPRESSION_SNAPPY, 1)
  else
    AC_SUBST(MONGOC_ENABLE_COMPRESSION_SNAPPY, 0)
  fi
  if test "$found_zlib" = "yes" -o "$bundled_zlib" = "yes"; then
    AC_SUBST(MONGOC_ENABLE_COMPRESSION_ZLIB, 1)
  else
    AC_SUBST(MONGOC_ENABLE_COMPRESSION_ZLIB, 0)
  fi
  if test "$found_zstd" = "yes"; then
    AC_SUBST(MONGOC_ENABLE_COMPRESSION_ZSTD, 1)
  else
    AC_SUBST(MONGOC_ENABLE_COMPRESSION_ZSTD, 0)
  fi
else
  AC_SUBST(MONGOC_ENABLE_COMPRESSION, 0)
  AC_SUBST(MONGOC_ENABLE_COMPRESSION_SNAPPY, 0)
  AC_SUBST(MONGOC_ENABLE_COMPRESSION_ZLIB, 0)
  AC_SUBST(MONGOC_ENABLE_COMPRESSION_ZSTD, 0)
fi