https://bugs.gentoo.org/764902

--- a/configure.ac
+++ b/configure.ac
@@ -342,7 +342,7 @@
 	echo "=============================="
 	CLANLIB_CHECK_LIB(png,  [`cat $srcdir/Setup/Tests/png.cpp`],  clanDisplay, [ *** Cannot find png (See http://www.libpng.org ) (Try libpng12-dev or better) ], [-lz -lpng])
 	CLANLIB_CHECK_LIB(jpeg, [`cat $srcdir/Setup/Tests/jpeg.cpp`], clanDisplay, [ *** Cannot find jpeg (See http://www.ijg.org ) (Try libjpeg62-dev or better) ], [ -ljpeg])
-	CLANLIB_CHECK_LIB(ttf, [`cat $srcdir/Setup/Tests/ttf.cpp`], clanDisplay, [ *** Cannot find ttf (freetype) (See http://freetype.sourceforge.net )  (Try libfreetype6-dev or better) ], [`freetype-config --libs` ], [ `freetype-config --cflags`])
+	CLANLIB_CHECK_LIB(ttf, [`cat $srcdir/Setup/Tests/ttf.cpp`], clanDisplay, [ *** Cannot find ttf (freetype) (See http://freetype.sourceforge.net )  (Try libfreetype6-dev or better) ], [`${PKG_CONFIG} --libs freetype2` ], [ `${PKG_CONFIG} --cflags freetype2`])
 
 	dnl  Optional linux/joystick.h
 	AC_CHECK_HEADERS(linux/joystick.h, linux_joystick=yes)