diff --git a/gnu/packages/antivirus.scm b/gnu/packages/antivirus.scm
index 4a01115abd9..d2060fa3852 100644
--- a/gnu/packages/antivirus.scm
+++ b/gnu/packages/antivirus.scm
@@ -116,10 +116,7 @@
           (add-after 'configure 'fix-cargo-inputs-vendoring
             (lambda _
               ;; Reproduce the original layout, fails with config.
-              (rename-file ".cargo/config" ".cargo/config.toml")
-              ;; Wrongly placed by configure
-              (delete-file-recursively
-               (string-append ".cargo/vendor/clamav-" #$version ".tar.zst"))))
+              (rename-file ".cargo/config" ".cargo/config.toml")))
           (add-after 'patch-cargo-checksums 'cmake-configure
             (lambda* (#:key outputs #:allow-other-keys)
               ((assoc-ref cmake:%standard-phases 'configure)
diff --git a/gnu/packages/gnome.scm b/gnu/packages/gnome.scm
index 97ad6e9d699..e760e4bcc81 100644
--- a/gnu/packages/gnome.scm
+++ b/gnu/packages/gnome.scm
@@ -3807,11 +3807,6 @@ for dealing with different structured file formats.")
                                      "--host=" #$(%current-target-system)))
                                 #~("--enable-vala")))
                      args)))
-          (add-after 'configure 'dont-vendor-self
-            (lambda* (#:key vendor-dir #:allow-other-keys)
-              ;; Don't keep the whole tarball in the vendor directory
-              (delete-file-recursively
-               (string-append vendor-dir "/" #$name "-" #$version ".tar.xz"))))
           (replace 'build
             (assoc-ref gnu:%standard-phases 'build))
           (replace 'check
diff --git a/gnu/packages/python-crypto.scm b/gnu/packages/python-crypto.scm
index 8887da9e002..8f413b45e1a 100644
--- a/gnu/packages/python-crypto.scm
+++ b/gnu/packages/python-crypto.scm
@@ -561,11 +561,6 @@ is used by the Requests library to verify HTTPS requests.")
       #:install-source? #false
       #:phases
       #~(modify-phases %standard-phases
-          (add-after 'configure 'dont-vendor-self
-            (lambda* (#:key vendor-dir #:allow-other-keys)
-              ;; Don't keep the whole tarball in the vendor directory
-              (delete-file-recursively
-               (string-append vendor-dir "/cryptography-" #$version ".tar.zst"))))
           (replace 'build
             (assoc-ref py:%standard-phases 'build))
           (delete 'check)
diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 2ab52e82c22..09ee9389736 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -23742,11 +23742,6 @@ members = [
           (add-after 'unpack 'prepare-source
             (lambda _
               (delete-file "native/Cargo.lock")))
-          (add-after 'configure 'dont-vendor-self
-            (lambda* (#:key vendor-dir #:allow-other-keys)
-              ;; Don't keep the whole tarball in the vendor directory
-              (delete-file-recursively
-                (string-append vendor-dir "/libcst-" #$version ".tar.zst"))))
           (replace 'build
             (assoc-ref py:%standard-phases 'build))
           (add-after 'install 'wrap
diff --git a/gnu/packages/syndication.scm b/gnu/packages/syndication.scm
index 30a1370c6dd..d6bb6be7494 100644
--- a/gnu/packages/syndication.scm
+++ b/gnu/packages/syndication.scm
@@ -312,11 +312,6 @@ cards.")
                  (("if curl-config")
                   (string-append
                     "if " (search-input-file inputs "/bin/curl-config"))))))
-           (add-after 'configure 'dont-vendor-self
-             (lambda* (#:key vendor-dir #:allow-other-keys)
-               ;; Don't keep the whole tarball in the vendor directory
-               (delete-file-recursively
-                 (string-append vendor-dir "/" #$name "-" #$version ".tar.xz"))))
            (add-after 'unpack 'patch-source
              (lambda* (#:key outputs #:allow-other-keys)
                (substitute* "Makefile"
diff --git a/guix/build/cargo-build-system.scm b/guix/build/cargo-build-system.scm
index e129c1a7f1a..9e0994d3606 100644
--- a/guix/build/cargo-build-system.scm
+++ b/guix/build/cargo-build-system.scm
@@ -71,27 +71,28 @@ root package."
           (call-with-input-file manifest-file get-string-all)
           "[package]"))))
 
-(define (crate-src? path)
+(define* (crate-src? path #:key source)
   "Check if PATH refers to a crate source, namely a gzipped tarball with a
 Cargo.toml file present at its root."
-  (if (directory-exists? path)
-      ;; The build system only handles sources containing single crate.
-      ;; Workspaces should be packaged into crates (via 'package phase)
-      ;; and used in inputs.
-      (cargo-package? path)
-      (and (not (string-suffix? "py" path)) ;sanity-check.py
-           ;; First we print out all file names within the tarball to see
-           ;; if it looks like the source of a crate. However, the tarball
-           ;; will include an extra path component which we would like to
-           ;; ignore (since we're interested in checking if a Cargo.toml
-           ;; exists at the root of the archive, but not nested anywhere
-           ;; else). We do this by cutting up each output line and only
-           ;; looking at the second component. We then check if it matches
-           ;; Cargo.toml exactly and short circuit if it does.
-           (invoke "sh" "-c"
-                   (string-append "tar -tf " path
-                                  " | cut -d/ -f2"
-                                  " | grep -q '^Cargo.toml$'")))))
+  (and (not (string=? path source))     ;Exclude self.
+       (if (directory-exists? path)
+           ;; The build system only handles sources containing single crate.
+           ;; Workspaces should be packaged into crates (via 'package phase)
+           ;; and used in inputs.
+           (cargo-package? path)
+           (and (not (string-suffix? "py" path)) ;sanity-check.py
+                ;; First we print out all file names within the tarball to see
+                ;; if it looks like the source of a crate. However, the tarball
+                ;; will include an extra path component which we would like to
+                ;; ignore (since we're interested in checking if a Cargo.toml
+                ;; exists at the root of the archive, but not nested anywhere
+                ;; else). We do this by cutting up each output line and only
+                ;; looking at the second component. We then check if it matches
+                ;; Cargo.toml exactly and short circuit if it does.
+                (invoke "sh" "-c"
+                        (string-append "tar -tf " path
+                                       " | cut -d/ -f2"
+                                       " | grep -q '^Cargo.toml$'"))))))
 
 (define* (unpack-rust-crates #:key inputs (vendor-dir "guix-vendor")
                              #:allow-other-keys)
@@ -156,7 +157,7 @@ libraries or executables."
          (format #t "error: Possible pre-generated file found: ~a~%" file)))
      (find-files "." (negate empty-file?)))))
 
-(define* (configure #:key inputs
+(define* (configure #:key source inputs
                     target system
                     (cargo-target #f)
                     (vendor-dir "guix-vendor")
@@ -173,7 +174,7 @@ libraries or executables."
       ((name . path)
        (let* ((basepath (strip-store-file-name path))
               (crate-dir (string-append vendor-dir "/" basepath)))
-         (and (crate-src? path)
+         (and (crate-src? path #:source source)
               ;; Gracefully handle duplicate inputs
               (not (file-exists? crate-dir))
               (if (directory-exists? path)