diff --git a/src/agner.erl b/src/agner.erl
index 413d77b..d9d1bf5 100644
--- a/src/agner.erl
+++ b/src/agner.erl
@@ -22,7 +22,13 @@ start() ->
         [_|_] ->
             ignore
     end,
-    filelib:ensure_dir(os:getenv("AGNER_PREFIX") ++ "/"),
+    case os:getenv("AGNER_EXACT_PREFIX") of
+        false ->
+            os:putenv("AGNER_EXACT_PREFIX",filename:join(os:getenv("AGNER_PREFIX"),"packages"));
+        [_|_] ->
+            ignore
+    end,
+    filelib:ensure_dir(os:getenv("AGNER_EXACT_PREFIX") ++ "/"),
 	inets:start(),
 	ssl:start(),
     inets:start(httpc,[{profile, agner}]),
diff --git a/src/agner_fetch.erl b/src/agner_fetch.erl
index a1125df..3d85a39 100644
--- a/src/agner_fetch.erl
+++ b/src/agner_fetch.erl
@@ -532,7 +532,7 @@ install_dirs(#opts_rec{ spec = {spec, Spec} } = Opts) ->
                   " $AGNER_INSTALL_PREFIX 2>/dev/null && true || true"},
              {bin_files, undefined}|Spec],
     
-    filelib:ensure_dir(filename:join([os:getenv("AGNER_PREFIX"),"packages"]) ++ "/"),
+    filelib:ensure_dir(os:getenv("AGNER_EXACT_PREFIX") ++ "/"),
     InstallPrefix = set_install_prefix(Opts),
     os:cmd("rm -rf " ++ InstallPrefix),
     ok = filelib:ensure_dir(InstallPrefix ++ "/"),
@@ -545,7 +545,7 @@ install_command(#opts_rec{ spec = {spec, Spec}, directory = Directory, quiet = Q
     os:putenv("AGNER_PACKAGE_NAME", Package),
     os:putenv("AGNER_PACKAGE_VERSION", Version),
 
-    filelib:ensure_dir(filename:join([os:getenv("AGNER_PREFIX"),"packages"]) ++ "/"),
+    filelib:ensure_dir(os:getenv("AGNER_EXACT_PREFIX") ++ "/"),
     InstallPrefix = set_install_prefix(Opts),
 
     ok = filelib:ensure_dir(InstallPrefix ++ "/"),
@@ -607,6 +607,6 @@ install_command(#opts_rec{ spec = {spec, Spec}, directory = Directory, quiet = Q
     end.
 
 set_install_prefix(#opts_rec{ package = Package, version = Version }) ->
-    InstallPrefix = filename:join([os:getenv("AGNER_PREFIX"),"packages",Package ++ "-" ++ Version]),
+    InstallPrefix = filename:join([os:getenv("AGNER_EXACT_PREFIX"), Package ++ "-" ++ Version]),
     os:putenv("AGNER_INSTALL_PREFIX", InstallPrefix),
     InstallPrefix.
diff --git a/src/agner_main.erl b/src/agner_main.erl
index 0c337e7..0c249b8 100644
--- a/src/agner_main.erl
+++ b/src/agner_main.erl
@@ -321,7 +321,7 @@ handle_command(prefix, Opts) ->
             io:format("ERROR: Package name required.~n");
         Package ->
             Version = proplists:get_value(version, Opts),
-            InstallPrefix = filename:join([os:getenv("AGNER_PREFIX"),"packages",Package ++ "-" ++ Version]),
+            InstallPrefix = filename:join([os:getenv("AGNER_EXACT_PREFIX"),Package ++ "-" ++ Version]),
             case filelib:is_dir(InstallPrefix) of
                 true ->
                     io:format("~s~n",[InstallPrefix]);
@@ -336,7 +336,7 @@ handle_command(uninstall, Opts) ->
             io:format("ERROR: Package name required.~n");
         Package ->
             Version = proplists:get_value(version, Opts),
-            InstallPrefix = filename:join([os:getenv("AGNER_PREFIX"),"packages",Package ++ "-" ++ Version]),
+            InstallPrefix = filename:join([os:getenv("AGNER_EXACT_PREFIX"),Package ++ "-" ++ Version]),
             case filelib:is_dir(InstallPrefix) of
                 true ->
                     io:format("Uninstalling...~n"),
@@ -427,9 +427,12 @@ handle_command(version, _) ->
 
 handle_command(config, []) ->
     io:format("prefix="), handle_command(config,[{variable, "prefix"}]),
+    io:format("exact_prefix="), handle_command(config,[{variable, "exact_prefix"}]),
     io:format("bin="), handle_command(config,[{variable, "bin"}]);
 handle_command(config, [{variable, "prefix"}]) ->
     io:format("~s~n",[os:getenv("AGNER_PREFIX")]);
+handle_command(config, [{variable, "exact_prefix"}]) ->
+    io:format("~s~n",[os:getenv("AGNER_EXACT_PREFIX")]);
 handle_command(config, [{variable, "bin"}]) ->
     io:format("~s~n",[os:getenv("AGNER_BIN")]).