gnu: zathura-pdf-poppler: Update to 0.2.9.

* gnu/packages/pdf.scm (zathura-pdf-poppler): Update to 0.2.9.
[build-system]: Switch to the Meson build system.
[arguments]: Trim accordingly.  Add a new ‘patch-plugin-directory’
phase.

gnu/packages/pdf.scm

@@ -460,27 +460,33 @@ by using the @code{mupdf} rendering library.")
 (define-public zathura-pdf-poppler
   (package
     (name "zathura-pdf-poppler")
-    (version "0.2.8")
+    (version "0.2.9")
     (source (origin
               (method url-fetch)
               (uri
                (string-append "https://pwmt.org/projects/zathura-pdf-poppler/download/zathura-pdf-poppler-"
-                              version ".tar.gz"))
+                              version ".tar.xz"))
               (sha256
                (base32
-                "1m55m7s7f8ng8a7lmcw9z4n5zv7xk4vp9n6fp9j84z6rk2imf7a2"))))
+                "1p4jcny0jniygns78mcf0nlm298dszh49qpmjmackrm6dq8hc25y"))))
     (native-inputs `(("pkg-config" ,pkg-config)))
     (inputs
      `(("poppler" ,poppler)
        ("zathura" ,zathura)))
-    (build-system gnu-build-system)
+    (build-system meson-build-system)
     (arguments
-     `(#:make-flags (list (string-append "PREFIX=" %output)
-                          (string-append "PLUGINDIR=" %output "/lib/zathura")
-                          "CC=gcc")
-       #:tests? #f ; Package does not include tests.
+     `(#:tests? #f                      ; package does not include tests
        #:phases
-       (modify-phases %standard-phases (delete 'configure))))
+       (modify-phases %standard-phases
+         (add-after 'unpack 'patch-plugin-directory
+           ;; Something of a regression in 0.2.9: the new Meson build system
+           ;; now hard-codes an incorrect plugin directory.  Fix it.
+           (lambda* (#:key outputs #:allow-other-keys)
+             (substitute* "meson.build"
+               (("(install_dir:).*" _ key)
+                (string-append key
+                               "'" (assoc-ref outputs "out") "/lib/zathura'\n")))
+             #t)))))
     (home-page "https://pwmt.org/projects/zathura-pdf-poppler/")
     (synopsis "PDF support for zathura (poppler backend)")
     (description "The zathura-pdf-poppler plugin adds PDF support to zathura