diff --git a/2ano2/Compiladores/antlr4-bin/view-javadoc b/2ano2/Compiladores/antlr4-bin/view-javadoc
index 2125582..1a4baee 100755
--- a/2ano2/Compiladores/antlr4-bin/view-javadoc
+++ b/2ano2/Compiladores/antlr4-bin/view-javadoc
@@ -4,15 +4,12 @@
 
 # change the following variables to point to browser and javadoc directories!
 
-#BROWSER="/usr/bin/firefox"
-BROWSER="firefox"
-JDKDIR1=$(ls -fd /usr/share/doc/openjdk-*-jre-headless)
-#JDKDIR1="/usr/share/doc/openjdk-8-jre-headless"
-#JDKDIR2="/usr/local/share/java/docs"
-JDKDIR2=""
-#OTHERDIR="/usr/local/doc"
-OTHERDIR="/usr/share/doc"
-#OTHERDIR=""
+# BROWSER="/usr/bin/firefox"
+# BROWSER="firefox"
+BROWSER="xdg-open"
+JDKDIR1="@JDK_DOCS_DIR@"
+# JDKDIR2=""
+# OTHERDIR=""
 
 if [ $# -eq 0 ]; then
   echo "Usage: view-javadoc <CLASS-NAME>"
@@ -40,7 +37,7 @@ case ${#docs[@]} in
   ;;
 1)
   doc=${docs[0]}
-  "$BROWSER" $doc &
+  "$BROWSER" $doc >/dev/null &
   ;;
 *)
   select doc in ${docs[@]}; do
diff --git a/2ano2/Compiladores/flake.lock b/2ano2/Compiladores/flake.lock
index 327c208..a3437a1 100644
--- a/2ano2/Compiladores/flake.lock
+++ b/2ano2/Compiladores/flake.lock
@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1705309234,
-        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "lastModified": 1709126324,
+        "narHash": "sha256-q6EQdSeUZOG26WelxqkmR7kArjgWCdw5sfJVHPH/7j8=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "rev": "d465f4819400de7c8d874d50b982301f28a84605",
         "type": "github"
       },
       "original": {
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1708958830,
-        "narHash": "sha256-dsoGSxCJfgisVIzaD6OzJ3xwTk989ZVoLaGLBZNyXmM=",
+        "lastModified": 1709404120,
+        "narHash": "sha256-7Y4ybnOhtHIQ47JDeilHKTZeSnFYFkkS2i1S6yFUiBc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "cec67db0d94418c44baae5b81e600c17605bc97d",
+        "rev": "680c69710d7f94ce712eaaadb2f6e7195c8b2fae",
         "type": "github"
       },
       "original": {
diff --git a/2ano2/Compiladores/flake.nix b/2ano2/Compiladores/flake.nix
index 7abdbe5..d87d574 100644
--- a/2ano2/Compiladores/flake.nix
+++ b/2ano2/Compiladores/flake.nix
@@ -13,12 +13,70 @@
         inherit system;
       };
     in {
-      devShell = pkgs.mkShell {
-        packages = with pkgs; [
-          jdk17
-          antlr
-          doxygen
-        ];
-      };
+      devShell = let
+        string-template = pkgs.stdenv.mkDerivation rec {
+          pname = "StringTemplate";
+          version = "4.3.4";
+          src = pkgs.fetchurl {
+            url = "https://www.stringtemplate.org/download/ST-${version}.jar";
+            sha256 = "sha256-+SesOExG10n4texolypTrtIeADE1CSmWFu23O/oV/zM=";
+          };
+          phases = ["installPhase"];
+          installPhase = ''
+            set -eu
+            mkdir -p $out/share/java
+            cp ${src} $out/share/java
+          '';
+        };
+
+        jdk-docs = pkgs.stdenv.mkDerivation rec {
+          pname = "jdk_doc-all";
+          version = "17.0.10";
+          src = pkgs.fetchzip {
+            url = "https://download.oracle.com/otn_software/java/jdk/${version}+11/a473b47039a34b169d45b00685dea3dd/jdk-${version}_doc-all.zip";
+            sha256 = "sha256-ZO1BMUhVa6c8C9ey/Ts5MROYA3P2YOkHMjbRs6kdImA=";
+          };
+          installPhase = ''
+            set -eu
+            mkdir -p $out/share/doc
+            cp -r . $out/share/doc
+          '';
+        };
+
+        antlr4-path = pkgs.symlinkJoin {
+          name = "antlr4-path";
+          paths = [pkgs.antlr string-template];
+        };
+
+        antlr4-bin = pkgs.stdenv.mkDerivation rec {
+          pname = "antlr4-bin";
+          version = "6.4";
+          src = ./antlr4-bin;
+          buildInputs = with pkgs; [bash bc];
+          nativeBuildInputs = [pkgs.makeWrapper pkgs.jdk17];
+          installPhase = ''
+            set -e
+            mkdir -p $out/bin
+
+            substituteInPlace view-javadoc \
+              --replace "@JDK_DOCS_DIR@" "${jdk-docs}/share/doc"
+
+            for filename in ./*; do
+              OUT=$out/bin/"$(basename "$filename")"
+              cp "$filename" "$OUT"
+              wrapProgram "$OUT" \
+                --prefix PATH : ${pkgs.lib.makeBinPath buildInputs} \
+                --set ANTLR4_PATH "${antlr4-path}/share/java"
+            done
+          '';
+        };
+      in
+        pkgs.mkShell {
+          packages = with pkgs; [
+            jdk17
+            doxygen
+            antlr4-bin
+          ];
+        };
     });
 }
diff --git a/2ano2/Compiladores/libs/ST-4.3.4.jar b/2ano2/Compiladores/libs/ST-4.3.4.jar
deleted file mode 100644
index 21a2f61..0000000
Binary files a/2ano2/Compiladores/libs/ST-4.3.4.jar and /dev/null differ