gnu: Add bsdiff.

* gnu/packages/compression.scm (bsdiff): New public variable.

gnu/packages/compression.scm

@@ -981,6 +981,43 @@ provides encoder and a decoder libraries: libbrotlienc and libbrotlidec,
 respectively, based on the reference implementation from Google.")
       (license license:expat))))
 
+(define-public bsdiff
+  (package
+    (name "bsdiff")
+    (version "4.3")
+    (home-page "https://www.daemonology.net/bsdiff/")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append home-page name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0j2zm3z271x5aw63mwhr3vymzn45p2vvrlrpm9cz2nywna41b0hq"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:make-flags (list "INSTALL=install" "CC=gcc"
+                          (string-append "PREFIX=" (assoc-ref %outputs "out")))
+       #:phases (modify-phases %standard-phases
+                  (delete 'configure)
+                  (add-before 'build 'fix-Makefile
+                    (lambda _
+                      (substitute* "Makefile"
+                        ;; Adjust syntax to make it compatible with GNU Make.
+                        (("^\\.") "")
+                        ;; Help install(1) create the target directory.
+                        (("\\$\\{PREFIX\\}") "-D -t ${PREFIX}"))
+                      #t)))
+       #:tests? #f)) ;no tests
+    (inputs
+     `(("bzip2" ,bzip2)))
+    (synopsis "Patch binary files")
+    (description
+     "@command{bsdiff} and @command{bspatch} are tools for building and
+applying patches to binary files.  By using suffix sorting (specifically
+Larsson and Sadakane's @code{qsufsort}) and taking advantage of how
+executable files change, bsdiff routinely produces binary patches 50-80%
+smaller than those produced by @code{Xdelta}.")
+    (license license:bsd-2)))
+
 (define-public cabextract
  (package
    (name "cabextract")