use ${version} in source

system/extra/file/ympbuild

@@ -6,8 +6,8 @@ url='https://www.darwinsys.com/file/'
 description="Identify a file's format by scanning binary data for patterns"
 email='kurth4cker@tutanota.com'
 maintainer='kurth4cker'
-source=(http://ftp.astron.com/pub/file/file-5.43.tar.gz)
-md5sums=(8effd70da368210a6c6eece037f978eb)
+source=("http://ftp.astron.com/pub/file/file-${version}.tar.gz")
+md5sums=('8effd70da368210a6c6eece037f978eb')
 group=(system.extra)
 uses=(bzip2 lzma zlib seccomp)
 zlib_depends=(zlib)