gnu: skymaker: Update to 4.2.0-0.1a69c47.

* gnu/packages/astronomy.scm (skymaker): Update to 4.2.0-0.1a69c47.
[source]: Use GIT-FETCH and GIT-FILE-NAME.
[arguments]: Remove upstreamed -fcommon work-around.
[native-inputs]: Add autoconf, automake, libtool, and pkg-config.

Co-authored-by: Tobias Geerinckx-Rice <me@tobias.gr>

gnu/packages/astronomy.scm

@@ -955,36 +955,43 @@ (define-public splash
     (license license:gpl2+)))
 
 (define-public skymaker
-  (package
-    (name "skymaker")
-    (version "3.10.5")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (string-append "https://www.astromatic.net/download/skymaker/"
-                           "skymaker-" version ".tar.gz"))
-       (sha256
-        (base32 "03zvx7c89plp9559niqv5532r233kza3ir992rg3nxjksqmrqvx1"))))
-    (build-system gnu-build-system)
-    (arguments
-     (list
-      #:configure-flags
-       #~(list
-        "CPPFLAGS=-fcommon"             ; fix build with GCC 10
-        (string-append
-         "--with-fftw-libdir=" #$(this-package-input "fftwf") "/lib")
-        (string-append
-         "--with-fftw-incdir=" #$(this-package-input "fftwf") "/include"))))
-    (inputs
-     (list fftwf))
-    (home-page "https://www.astromatic.net/software/skymaker")
-    (synopsis "Astronomical image simulator")
-    (description
-     "SkyMaker is a program that simulates astronomical images.  It accepts
+  ;; XXX: No version tag available in GitHub.
+  ;; See: https://github.com/astromatic/skymaker/issues/3
+  (let ((commit "1a69c4716bdc9b5c6d4a917b0bc2dbd47635c459")
+        (revision "0"))
+    (package
+      (name "skymaker")
+      (version (git-version "4.2.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/astromatic/skymaker")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "1vin4vgvcmqmwjdchsxnap374559rksz55xmaliawnl3qpzxn1nk"))))
+      (build-system gnu-build-system)
+      (arguments
+       (list
+        #:configure-flags
+        #~(list
+           (string-append
+            "--with-fftw-libdir=" #$(this-package-input "fftwf") "/lib")
+           (string-append
+            "--with-fftw-incdir=" #$(this-package-input "fftwf") "/include"))))
+      (native-inputs
+       (list autoconf automake libtool pkg-config))
+      (inputs
+       (list fftwf))
+      (home-page "https://www.astromatic.net/software/skymaker")
+      (synopsis "Astronomical image simulator")
+      (description
+       "SkyMaker is a program that simulates astronomical images.  It accepts
 object lists in ASCII generated by the Stuff program to produce realistic
 astronomical fields.  SkyMaker is part of the EFIGI
 (@url{https://www.astromatic.net/projects/efigi}) development project.")
-    (license license:gpl3+)))
+      (license license:gpl3+))))
 
 (define-public stackistry
   (package