diff --git a/pkgs/build-support/upstream-updater/update-walker-service-specific.sh b/pkgs/build-support/upstream-updater/update-walker-service-specific.sh
index 234f27ff1d10..4f3a7110346e 100644
--- a/pkgs/build-support/upstream-updater/update-walker-service-specific.sh
+++ b/pkgs/build-support/upstream-updater/update-walker-service-specific.sh
@@ -3,3 +3,7 @@ SF_redirect () {
   process 'http://[a-z]+[.]dl[.]sourceforge[.]net/' 'mirror://sourceforge/'
   process '[?].*' ''
 }
+
+SF_version_dir () {
+  version_link 'http://sourceforge.net/.+/[0-9.]+/$'
+}
diff --git a/pkgs/tools/graphics/asymptote/default.nix b/pkgs/tools/graphics/asymptote/default.nix
index e9baac43cbdd..6a2b799f2b4e 100644
--- a/pkgs/tools/graphics/asymptote/default.nix
+++ b/pkgs/tools/graphics/asymptote/default.nix
@@ -8,7 +8,15 @@ a @ {
 
   ...}:
 let
-  s = import ./src-for-default.nix;
+  s = # Generated upstream information
+  rec {
+    baseName="asymptote";
+    version="2.21";
+    name="asymptote-2.21";
+    hash="07lkj0xnxpanfscmbm30lw6j9484rlmmqpnl0mhs7nx9h2lczrjz";
+    url="mirror://sourceforge/project/asymptote/2.21/asymptote-2.21.src.tgz";
+    sha256="07lkj0xnxpanfscmbm30lw6j9484rlmmqpnl0mhs7nx9h2lczrjz";
+  };
   buildInputs = with a; [
     freeglut ghostscriptX imagemagick fftw boehmgc
     mesa ncurses readline gsl libsigsegv python zlib
diff --git a/pkgs/tools/graphics/asymptote/src-for-default.nix b/pkgs/tools/graphics/asymptote/src-for-default.nix
deleted file mode 100644
index 277393283abb..000000000000
--- a/pkgs/tools/graphics/asymptote/src-for-default.nix
+++ /dev/null
@@ -1,7 +0,0 @@
-rec {
-   version="2.20";
-   name="asymptote-2.20";
-   hash="0ji45v0d9jps8clsl86pvmr22acci3f0ciicmyzak6dbczqyrj80";
-   url="http://downloads.sourceforge.net/project/asymptote/${version}/asymptote-${version}.src.tgz";
-   advertisedUrl="http://downloads.sourceforge.net/project/asymptote/2.20/asymptote-2.20.src.tgz";
-}
diff --git a/pkgs/tools/graphics/asymptote/src-info-for-default.nix b/pkgs/tools/graphics/asymptote/src-info-for-default.nix
deleted file mode 100644
index dbfd064f51a1..000000000000
--- a/pkgs/tools/graphics/asymptote/src-info-for-default.nix
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  downloadPage = "http://sourceforge.net/projects/asymptote/files/";
-  baseName = "asymptote";
-  sourceRegexp = ".*[.]src[.]tgz";
-  versionExtractorSedScript = ''$extractReleaseSF'';
-  versionReferenceCreator = ''$(replaceAllVersionOccurences)'';
-  choiceCommand = ''head -1 | sed -re "$skipRedirectSF"'';
-}