---- a/configure
-+++ b/configure
-@@ -12646,100 +12646,6 @@ else
- BUILD_TOOLS_FALSE=
- fi
-
--if test x$build_tools = xyes ; then
--
--pkg_failed=no
--{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for png" >&5
--$as_echo_n "checking for png... " >&6; }
--
--if test -n "$png_CFLAGS"; then
-- pkg_cv_png_CFLAGS="$png_CFLAGS"
-- elif test -n "$PKG_CONFIG"; then
-- if test -n "$PKG_CONFIG" && \
-- { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"\"libpng\"\""; } >&5
-- ($PKG_CONFIG --exists --print-errors ""libpng"") 2>&5
-- ac_status=$?
-- $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-- test $ac_status = 0; }; then
-- pkg_cv_png_CFLAGS=`$PKG_CONFIG --cflags ""libpng"" 2>/dev/null`
-- test "x$?" != "x0" && pkg_failed=yes
--else
-- pkg_failed=yes
--fi
-- else
-- pkg_failed=untried
--fi
--if test -n "$png_LIBS"; then
-- pkg_cv_png_LIBS="$png_LIBS"
-- elif test -n "$PKG_CONFIG"; then
-- if test -n "$PKG_CONFIG" && \
-- { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"\"libpng\"\""; } >&5
-- ($PKG_CONFIG --exists --print-errors ""libpng"") 2>&5
-- ac_status=$?
-- $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-- test $ac_status = 0; }; then
-- pkg_cv_png_LIBS=`$PKG_CONFIG --libs ""libpng"" 2>/dev/null`
-- test "x$?" != "x0" && pkg_failed=yes
--else
-- pkg_failed=yes
--fi
-- else
-- pkg_failed=untried
--fi
--
--
--
--if test $pkg_failed = yes; then
-- { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
--$as_echo "no" >&6; }
--
--if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
-- _pkg_short_errors_supported=yes
--else
-- _pkg_short_errors_supported=no
--fi
-- if test $_pkg_short_errors_supported = yes; then
-- png_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs ""libpng"" 2>&1`
-- else
-- png_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs ""libpng"" 2>&1`
-- fi
-- # Put the nasty error message in config.log where it belongs
-- echo "$png_PKG_ERRORS" >&5
--
-- as_fn_error $? "Package requirements (\"libpng\") were not met:
--
--$png_PKG_ERRORS
--
--Consider adjusting the PKG_CONFIG_PATH environment variable if you
--installed software in a non-standard prefix.
--
--Alternatively, you may set the environment variables png_CFLAGS
--and png_LIBS to avoid the need to call pkg-config.
--See the pkg-config man page for more details." "$LINENO" 5
--elif test $pkg_failed = untried; then
-- { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
--$as_echo "no" >&6; }
-- { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
--$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
--as_fn_error $? "The pkg-config script could not be found or is too old. Make sure it
--is in your PATH or set the PKG_CONFIG environment variable to the full
--path to pkg-config.
--
--Alternatively, you may set the environment variables png_CFLAGS
--and png_LIBS to avoid the need to call pkg-config.
--See the pkg-config man page for more details.
--
--To get pkg-config, see <http://pkg-config.freedesktop.org/>.
--See \`config.log' for more details" "$LINENO" 5; }
--else
-- png_CFLAGS=$pkg_cv_png_CFLAGS
-- png_LIBS=$pkg_cv_png_LIBS
-- { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
--$as_echo "yes" >&6; }
--
--fi
--fi
--
-
- # Check whether --with-tests was given.
- if test "${with_tests+set}" = set; then :