Solaris doesn't come with readlink so use greadlink if available instead. (Taken…

Solaris doesn't come with readlink so use greadlink if available instead. (Taken from Ryan Tomayko's "GNU is killing Solaris", c.f. http://tomayko.com/writings/gnu-is-killing-solaris)

bin/ruby-build

@@ -3,6 +3,10 @@
 set -E
 exec 3<&2 # preserve original stderr at fd 3
 
+resolve_link() {
+  $(type -p greadlink readlink | head -1) $1
+}
+
 abs_dirname() {
   local cwd="$(pwd)"
   local path="$1"
@@ -10,7 +14,7 @@ abs_dirname() {
   while [ -n "$path" ]; do
     cd "${path%/*}"
     local name="${path##*/}"
-    path="$(readlink "$name" || true)"
+    path="$(resolve_link "$name" || true)"
   done
 
   pwd