gnu: Add man-db.

* gnu/packages.man.scm (man-db): New variable.

gnu/packages/man.scm

@@ -20,7 +20,13 @@
   #:use-module (guix licenses)
   #:use-module (guix download)
   #:use-module (guix packages)
-  #:use-module (guix build-system gnu))
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages flex)
+  #:use-module (gnu packages gdbm)
+  #:use-module (gnu packages groff)
+  #:use-module (gnu packages less)
+  #:use-module (gnu packages lynx)
+  #:use-module (gnu packages pkg-config))
 
 (define-public libpipeline
   (package
@@ -41,3 +47,63 @@
      "libpipeline is a C library for manipulating pipelines of subprocesses in
 a flexible and convenient way.")
     (license gpl3+)))
+
+(define-public man-db
+  (package
+    (name "man-db")
+    (version "2.6.6")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://savannah/man-db/man-db-"
+                                  version ".tar.xz"))
+              (sha256
+               (base32
+                "1hv6byj6sg6cp3jyf08gbmdm4pwhvd5hzmb94xl0w7prin6hzabx"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:phases
+       (alist-cons-after
+        'patch-source-shebangs 'patch-test-shebangs
+        (lambda* (#:key outputs #:allow-other-keys)
+          ;; Patch shebangs in test scripts.
+          (let ((out (assoc-ref outputs "out")))
+            (for-each (lambda (file)
+                        (substitute* file
+                          (("#! /bin/sh")
+                           (string-append "#!" (which "sh")))))
+                      (remove file-is-directory?
+                              (find-files "src/tests" ".*")))))
+        %standard-phases)
+       #:configure-flags
+       (let ((groff (assoc-ref %build-inputs "groff"))
+             (less  (assoc-ref %build-inputs "less"))
+             (gzip  (assoc-ref %build-inputs "gzip"))
+             (bzip2  (assoc-ref %build-inputs "bzip2"))
+             (xz  (assoc-ref %build-inputs "xz")))
+         ;; Invoke groff, less, gzip, bzip2, and xz directly from the store.
+         (append (list "--disable-setuid" ;; Disable setuid man user.
+                       (string-append "--with-pager=" less "/bin/less")
+                       (string-append "--with-gzip=" gzip "/bin/gzip")
+                       (string-append "--with-bzip2=" bzip2 "/bin/gzip")
+                       (string-append "--with-xz=" xz "/bin/xz"))
+                 (map (lambda (prog)
+                        (string-append "--with-" prog "=" groff "/bin/" prog))
+                      '("nroff" "eqn" "neqn" "tbl" "refer" "pic"))))
+       #:modules ((guix build gnu-build-system)
+                  (guix build utils)
+                  (srfi srfi-1))))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (inputs
+     `(("flex" ,flex)
+       ("gdbm" ,gdbm)
+       ("groff" ,groff)
+       ("less" ,less)
+       ("libpipeline" ,libpipeline)))
+    (home-page "http://man-db.nongnu.org/")
+    (synopsis "Standard Unix documentation system")
+    (description
+     "Man-db is an implementation of the standard Unix documentation system
+accessed using the man command.  It uses a Berkeley DB database in place of
+the traditional flat-text whatis databases.")
+    (license gpl2+)))