gnu: guile-gdbm-ffi: Add support for gdbm-1.14.

* gnu/packages/patches/guile-gdbm-ffi-support-gdbm-1.14.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

* gnu/packages/guile.scm (guile-gdbm-ffi)[inputs]: Move above arguments.  Add
the patch, and the 'patch' program.
[propagated-inputs]: Move above arguments.
[arguments]: In the builder, add code to apply the patch.

gnu/local.mk

@@ -742,6 +742,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/guile-1.8-cpp-4.5.patch			\
   %D%/packages/patches/guile-2.2-default-utf8.patch		\
   %D%/packages/patches/guile-default-utf8.patch			\
+  %D%/packages/patches/guile-gdbm-ffi-support-gdbm-1.14.patch	\
   %D%/packages/patches/guile-linux-syscalls.patch		\
   %D%/packages/patches/guile-present-coding.patch		\
   %D%/packages/patches/guile-relocatable.patch			\

gnu/packages/guile.scm

@@ -1134,6 +1134,15 @@ (define-public guile-gdbm-ffi
                (base32
                 "1j8wrsw7v9w6qkl47xz0rdikg50v16nn6kbs3lgzcymjzpa7babj"))))
     (build-system trivial-build-system)
+    (inputs
+     `(("guile" ,guile-2.2)
+       ;; patch-and-repack doesn't work for git checkouts,
+       ;; so we must apply the patch manually.
+       ("patch" ,patch)
+       ("patch-file" ,(search-patch
+                       "guile-gdbm-ffi-support-gdbm-1.14.patch"))))
+    (propagated-inputs
+     `(("gdbm" ,gdbm)))
     (arguments
      `(#:modules
        ((guix build utils))
@@ -1186,12 +1195,16 @@ (define-public guile-gdbm-ffi
               (format #f "(dynamic-link \"~a/lib/libgdbm.so\")"
                       (assoc-ref %build-inputs "gdbm"))))
 
+           ;; Apply the patch to add support for gdbm-1.14.
+           (let ((patch-command (string-append (assoc-ref %build-inputs "patch")
+                                               "/bin/patch"))
+                 (patch-file (assoc-ref %build-inputs "patch-file")))
+             (with-directory-excursion (dirname gdbm.scm-dest)
+               (format #t "applying '~a'...~%" patch-file)
+               (invoke patch-command "--force" "--input" patch-file)))
+
            ;; compile to the destination
            (compile-file gdbm.scm-dest gdbm.go-dest)))))
-    (inputs
-     `(("guile" ,guile-2.2)))
-    (propagated-inputs
-     `(("gdbm" ,gdbm)))
     (home-page "https://github.com/ijp/guile-gdbm")
     (synopsis "Guile bindings to the GDBM library via Guile's FFI")
     (description

gnu/packages/patches/guile-gdbm-ffi-support-gdbm-1.14.patch

@@ -0,0 +1,53 @@
+From 1da99396dc65993ba34ac0370ca5d6acda6a3322 Mon Sep 17 00:00:00 2001
+From: Mark H Weaver <mhw@netris.org>
+Date: Sun, 18 Mar 2018 07:02:37 -0400
+Subject: [PATCH] Add support for gdbm-1.14.
+
+As of gdbm-1.14, 'gdbm_errno' no longer exists as a binary interface.
+It has been replaced by 'gdbm_errno_location', a function that returns
+int*.  We now use this new interface if it's available.
+---
+ gdbm.scm | 18 ++++++++++++++++--
+ 1 file changed, 16 insertions(+), 2 deletions(-)
+
+diff --git a/gdbm.scm b/gdbm.scm
+index b92992f..4d38cc3 100644
+--- a/gdbm.scm
++++ b/gdbm.scm
+@@ -17,6 +17,9 @@
+ ;; You should have received a copy of the GNU General Public License
+ ;; along with this program. If not, see <http://www.gnu.org/licenses/>.
+ 
++;; Modified by Mark H Weaver <mhw@netris.org> in March 2018 to support
++;; gdbm-1.14 with its new 'gdbm_errno_location' interface.
++
+ (define-module (gdbm)
+   #:use-module (system foreign)
+   #:use-module (rnrs bytevectors)
+@@ -151,10 +154,21 @@
+ 
+ ;;; errors
+ 
+-(define %errno (dynamic-pointer "gdbm_errno" libgdbm))
++(define %list-int
++  (list int))
++
++(define (dereference-int ptr)
++  (apply (lambda (errno) errno)
++         (parse-c-struct ptr %list-int)))
++
++(define %errno-location
++  (or (false-if-exception
++       (let ((func (dynamic-func "gdbm_errno_location" libgdbm)))
++         (pointer->procedure '* func '())))
++      (const (dynamic-pointer "gdbm_errno" libgdbm))))
+ 
+ (define (gdbm-errno)
+-  (pointer-address (dereference-pointer %errno)))
++  (dereference-int (%errno-location)))
+ 
+ (define (gdbm-error)
+   (error (pointer->string (%gdbm-strerror (gdbm-errno)))))
+-- 
+2.16.2
+