[opam] opam configuration for public release

opam

 opam-version: "2.0"
 name: "frama-c-metacsl"
 synopsis: "MetACSL plugin of Frama-C for writing pervasives properties"
-version: "0.0+THS-2"
+version: "0.0"
 description:"""
 MetACSL let users write properties that need to be checked at particular
 contexts (e.g. each time a location is written to inside a given set
@@ -14,9 +14,9 @@ authors: [
   "Virgile Robles"
 ]
 homepage: "http://frama-c.com/"
-license: "CEA proprietary licence"
-dev-repo: "git+https://git.frama-c.com/pub/frama-c.git"
-bug-reports: "https://git.frama-c.com/pub/frama-c/-/issues"
+license: "LGPLv2.1"
+dev-repo: "git+https://git.frama-c.com/pub/meta.git"
+bug-reports: "https://git.frama-c.com/pub/meta/-/issues"
 tags: [
   "program verification"
   "formal specification"
@@ -25,6 +25,7 @@ tags: [
 ]
 
 build: [
+  ["autoconf"] {pinned}
   ["./configure"]
   [make "-j%{jobs}%"]
 ]
@@ -35,6 +36,6 @@ install: [
 
 depends: [
   "ocaml" { >= "4.05.0" & ( < "4.08.0~" | >= "4.08.1" ) }
-  "frama-c" { >= "21.0" & <= "21.1" }
+  "frama-c" { >= "21.1+dev" }
   "why3" { >= "1.3.1" }
 ]