https://gitlab.freedesktop.org/freetype/freetype/-/merge_requests/156

--- freetype-2.12.0/builds/unix/configure.ac
+++ freetype-2.12.0/builds/unix/configure.ac
@@ -530,13 +530,20 @@
                [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"
 
+# 'librsvg' is needed to demonstrate SVG support.
+AC_ARG_WITH([librsvg],
+  [AS_HELP_STRING([--with-librsvg=@<:@yes|no|auto@:>@],
+                  [librsvg is needed to demonstrate SVG support in demos @<:@default=auto@:>@])],
+  [], [with_librsvg=auto])
+
+have_librsvg=no
+AS_IF([test x"$with_librsvg" != xno], [
+	PKG_CHECK_MODULES([LIBRSVG], [librsvg-2.0 >= 2.46.0],
+			  [have_librsvg="yes (pkg-config)"])
+])
 if test "$have_librsvg" != no; then
   FT_DEMO_CFLAGS="$FT_DEMO_CFLAGS $LIBRSVG_CFLAGS -DHAVE_LIBRSVG"
   FT_DEMO_LDFLAGS="$FT_DEMO_LDFLAGS $LIBRSVG_LIBS"
--- freetype-2.12.0/builds/unix/configure.raw
+++ freetype-2.12.0/builds/unix/configure.raw
@@ -530,13 +530,20 @@
                [test "$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"
 
+# 'librsvg' is needed to demonstrate SVG support.
+AC_ARG_WITH([librsvg],
+  [AS_HELP_STRING([--with-librsvg=@<:@yes|no|auto@:>@],
+                  [librsvg is needed to demonstrate SVG support in demos @<:@default=auto@:>@])],
+  [], [with_librsvg=auto])
+
+have_librsvg=no
+AS_IF([test x"$with_librsvg" != xno], [
+	PKG_CHECK_MODULES([LIBRSVG], [librsvg-2.0 >= 2.46.0],
+			  [have_librsvg="yes (pkg-config)"])
+])
 if test "$have_librsvg" != no; then
   FT_DEMO_CFLAGS="$FT_DEMO_CFLAGS $LIBRSVG_CFLAGS -DHAVE_LIBRSVG"
   FT_DEMO_LDFLAGS="$FT_DEMO_LDFLAGS $LIBRSVG_LIBS"