gnu: fontforge: Support build on the Hurd.

* gnu/packages/patches/fontforge-hurd.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/fontutils.scm (fontforge)[arguments]: When building natively on
the Hurd, add new phase 'apply-hurd-patch' and use it, and replace phase
'check' to skip two tests.

gnu/local.mk

@@ -1146,6 +1146,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/flatpak-unset-gdk-pixbuf-for-sandbox.patch	\
   %D%/packages/patches/fluxbox-1.3.7-no-dynamic-cursor.patch	\
   %D%/packages/patches/fontconfig-cache-ignore-mtime.patch	\
+  %D%/packages/patches/fontforge-hurd.patch			\
   %D%/packages/patches/foobillard++-pkg-config.patch		\
   %D%/packages/patches/foomatic-filters-CVE-2015-8327.patch	\
   %D%/packages/patches/foomatic-filters-CVE-2015-8560.patch	\

gnu/packages/fontutils.scm

@@ -1534,12 +1534,13 @@ definitions.")
              ("python"          ,python)
              ("zlib"            ,zlib)))
    (arguments
-    '(#:configure-flags '(;; TODO: Provide GTK+ for the Wayland-friendly GDK
+    (list
+     #:configure-flags #~'( ;; TODO: Provide GTK+ for the Wayland-friendly GDK
                            ;; backend, instead of the legacy X11 backend.
                            ;; Currently it introduces a circular dependency.
                            "-DENABLE_X11=ON")
       #:phases
-      (modify-phases %standard-phases
+      #~(modify-phases %standard-phases
           (add-after 'unpack 'do-not-override-RPATH
             (lambda _
               ;; Do not attempt to set a default RPATH, as our ld-wrapper
@@ -1548,6 +1549,33 @@ definitions.")
                 (("^set_default_rpath\\(\\)")
                  ""))
               #t))
+          #$@(if (target-hurd?)
+                 #~((add-after 'unpack 'apply-hurd-patch
+                      (lambda _
+                        (let ((patch-file
+                               #$(local-file
+                                  (search-patch "fontforge-hurd.patch"))))
+                          (invoke "patch" "--force" "-p1" "-i" patch-file)))))
+                 #~())
+          #$@(if (system-hurd?)
+                 #~((replace 'check
+                      ;; cmake-build-system ignores #:make-flags for make check
+                      (lambda* (#:key test-target tests? parallel-tests?
+                                #:allow-other-keys)
+                        (let ((skip '("test0001_py" "test0001_pyhook")))
+                          (if tests?
+                              (let ((jobs
+                                     (if parallel-tests?
+                                         (number->string (parallel-job-count))
+                                         "1")))
+                                (invoke "make"
+                                        (string-append "ARGS=-j " jobs
+                                                       " --exclude-regex ^"
+                                                       (string-join skip "\\|")
+                                                       "$")
+                                        test-target))
+                              (format #t "test suite not run~%"))))))
+                 #~())
           (add-after 'install 'set-library-path
             (lambda* (#:key inputs outputs #:allow-other-keys)
               (let ((out (assoc-ref outputs "out"))

gnu/packages/patches/fontforge-hurd.patch

@@ -0,0 +1,82 @@
+Upstream status: Taken from upstream.
+
+From dca87c025665f0f010f906a4eba96da9794a4d04 Mon Sep 17 00:00:00 2001
+From: Anthony Fok <foka@debian.org>
+Date: Thu, 16 Jun 2022 02:40:23 -0600
+Subject: [PATCH] Define PATH_MAX and MAXPATHLEN for GNU/Hurd compatibility
+
+Special thanks to @henrich, @ucko and @kilobyte for reporting the issue
+and offering suggestions on a fix.
+
+See also https://bugs.debian.org/877795
+
+Fixes #3119
+---
+ inc/basics.h | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/inc/basics.h b/inc/basics.h
+index b8d65823b..14590c5b1 100644
+--- a/inc/basics.h
++++ b/inc/basics.h
+@@ -123,5 +123,13 @@ static inline int imax(int a, int b)
+ 			last = newitem;		       \
+ 		    }
+ 
++#ifdef __GNU__
++# ifndef PATH_MAX
++#  define PATH_MAX 4096
++# endif
++# ifndef MAXPATHLEN
++#  define MAXPATHLEN 4096
++# endif
++#endif
+ 
+ #endif /* FONTFORGE_BASICS_H */
+-- 
+2.40.1
+
+From e0480f143f27f8f2686b5b14d7d302fe22f35002 Mon Sep 17 00:00:00 2001
+From: Anthony Fok <foka@debian.org>
+Date: Thu, 16 Jun 2022 03:06:56 -0600
+Subject: [PATCH] Undefine "extended" macro temporarily on GNU Hurd
+
+GNU Mach microkernel header files (gnumach-dev 1.8+git20201129) added to
+struct i386_xfp_save in /usr/include/i386-gnu/include/mach/i386/fp_reg.h
+a new "extended" field which happens to collide with the macro definition
+"#define extended double" in FontForge, leading to FTBFS on GNU Hurd.
+
+This issue may be circumvented by temporarily undefining the "extended"
+macro before loading `<gio/gio.h>` and friends, and redefining the
+"extended" macro right after.
+---
+ inc/ffglib.h | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/inc/ffglib.h b/inc/ffglib.h
+index f3419f0ab..25fe9ebde 100644
+--- a/inc/ffglib.h
++++ b/inc/ffglib.h
+@@ -26,11 +26,19 @@
+ #define GMenuItem GMenuItem_GIO
+ #define GTimer GTimer_GTK
+ 
++#ifdef __GNU__
++# undef extended
++#endif
++
+ #include <gio/gio.h>
+ #include <glib-object.h>
+ #include <glib.h>
+ #include <glib/gstdio.h>
+ 
++#ifdef __GNU__
++# define extended	double
++#endif
++
+ #undef GList
+ #undef GMenuItem
+ #undef GTimer
+-- 
+2.40.1
+