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* builds/unix/configure.raw: Add option `--with-librsvg`.

Since 'librsvg' is written in Rust, this option allows distributions to
avoid a dependency on the entire Rust toolchain to provide the FreeType demo
programs.

Suggested by Lars Wendler in !156.

git/fs: mount .git/fs: mount/attach disallowed

--- a/builds/unix/configure.raw

+++ b/builds/unix/configure.raw

@@ -530,16 +530,28 @@

                [test "$ac_cv_search_clock_gettime" = "none required" \

                 || LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])

-# 'librsvg' is needed to demonstrate SVG support.

-PKG_CHECK_MODULES([LIBRSVG], [librsvg-2.0 >= 2.46.0],

-                  [have_librsvg="yes (pkg-config)"], [have_librsvg=no])

-

 FT_DEMO_CFLAGS=""

 FT_DEMO_LDFLAGS="$LIB_CLOCK_GETTIME"

-if test "$have_librsvg" != no; then

-  FT_DEMO_CFLAGS="$FT_DEMO_CFLAGS $LIBRSVG_CFLAGS -DHAVE_LIBRSVG"

-  FT_DEMO_LDFLAGS="$FT_DEMO_LDFLAGS $LIBRSVG_LIBS"

+# 'librsvg' is needed to demonstrate SVG support.

+AC_ARG_WITH([librsvg],

+  [AS_HELP_STRING([--with-librsvg=@<:@yes|no|auto@:>@],

+                  [support OpenType SVG fonts in FreeType demo programs @<:@default=auto@:>@])],

+  [], [with_librsvg=auto])

+

+have_librsvg=no

+if test x"$with_librsvg" = xyes -o x"$with_librsvg" = xauto; then

+  PKG_CHECK_MODULES([LIBRSVG], [librsvg-2.0 >= 2.46.0],

+                    [have_librsvg="yes (pkg-config)"], [:])

+

+  if test "$have_librsvg" != no; then

+    FT_DEMO_CFLAGS="$FT_DEMO_CFLAGS $LIBRSVG_CFLAGS -DHAVE_LIBRSVG"

+    FT_DEMO_LDFLAGS="$FT_DEMO_LDFLAGS $LIBRSVG_LIBS"

+  fi

+fi

+

+if test x"$with_librsvg" = xyes -a "$have_librsvg" = no; then

+  AC_MSG_ERROR([librsvg support requested but library not found])

 fi

 AC_SUBST([FT_DEMO_CFLAGS])