graphics/libgltext: prepare for freetype2 update

- freetype2 will no longer ship freetype-config (which was a pkg-config
wrapper) in the near future -- use pkg-config to gather the required
flags.

PR:             251512

graphics/libgltext/Makefile

@@ -15,7 +15,7 @@ LICENSE_FILE=	${WRKSRC}/COPYING
 
 LIB_DEPENDS=	libfreetype.so:print/freetype2
 
-USES=		gl gmake localbase libtool xorg
+USES=		gl gmake localbase libtool pkgconfig xorg
 USE_GL=		gl glu
 USE_XORG=	x11 xmu
 GNU_CONFIGURE=	yes
@@ -26,6 +26,8 @@ OPTIONS_SUB=	yes
 EXAMPLES_DESC=	Compile examples, need libglut
 EXAMPLES_USE=	GL=glut
 
+BINARY_ALIAS=	freetype-config=true
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/src/.libs/${PORTNAME}-${PORTVERSION}.so \
 		${STAGEDIR}${PREFIX}/lib/${PORTNAME}.so.0

graphics/libgltext/files/patch-configure

@@ -0,0 +1,13 @@
+--- configure.orig	2021-08-07 06:08:17 UTC
++++ configure
+@@ -8610,8 +8610,8 @@ if test "$FT_CONFIG" = "" ; then
+ echo "$as_me: error: freetype not found" >&2;}
+    { (exit 1); exit 1; }; }
+ fi
+-FT_FLAGS=`freetype-config --cflags`
+-FT_LIBS=`freetype-config --libs`
++FT_FLAGS=`pkg-config freetype2 --cflags`
++FT_LIBS=`pkg-config freetype2 --libs`
+ CXXFLAGS="$FT_FLAGS $CXXFLAGS"
+ LIBS="$FT_LIBS $LIBS"
+