New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/16630#issuecomment-616125363

Comment:
This is for building with system ffmpeg. Build failure, though.
```diff
diff --git a/srcpkgs/stepmania/template b/srcpkgs/stepmania/template
index b416cfa4a5..7e0355708c 100644
--- a/srcpkgs/stepmania/template
+++ b/srcpkgs/stepmania/template
@@ -3,10 +3,11 @@ pkgname=stepmania
 version=5.0.12
 revision=3
 build_style=cmake
+configure_args="-DWITH_SYSTEM_FFMPEG=ON"
 cmake_builddir="Build"
-hostmakedepends="nasm yasm pkg-config git"
+hostmakedepends="nasm yasm pkg-config"
 makedepends="libmad-devel libvorbis-devel pcre-devel libjpeg-turbo-devel
-alsa-lib-devel libXrandr-devel libva-devel glew-devel"
+alsa-lib-devel libXrandr-devel libva-devel glew-devel ffmpeg-devel"
 short_desc="Advanced rhythm game"
 maintainer="Michael Aldridge <maldridge@voidlinux.org>"
 license="MIT"
```