gnu: xterm: Make big cursors work.

* gnu/packages/patches/xterm-370-explicit-xcursor.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/xorg.scm (xterm)[source]: Add it.
[arguments]<#:configure-flags>: Add "-lXcursor".

gnu/local.mk

@@ -1975,6 +1975,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/xsane-fix-snprintf-buffer-length.patch	\
   %D%/packages/patches/xsane-support-ipv6.patch			\
   %D%/packages/patches/xsane-tighten-default-umask.patch	\
+  %D%/packages/patches/xterm-370-explicit-xcursor.patch		\
   %D%/packages/patches/xygrib-fix-finding-data.patch		\
   %D%/packages/patches/yggdrasil-extra-config.patch	\
   %D%/packages/patches/ytfzf-programs.patch        \

gnu/packages/patches/xterm-370-explicit-xcursor.patch

@@ -0,0 +1,37 @@
+From: Danny Milosavljevic <dannym@scratchpost.org>
+Date: Thu, 2 Apr 2022 12:10:00 +0200
+Subject: Make xterm use libxcursor directly
+
+Fixes <https://issues.guix.gnu.org/54654>.
+
+This patch makes xterm use libxcursor directly.
+Without it, libx11 would try to dlopen("libXcursor.so.1") and fail.
+
+--- xterm-370/misc.c.orig	2022-04-02 11:52:26.225131854 +0200
++++ xterm-370/misc.c	2022-04-02 12:06:13.091482385 +0200
+@@ -79,6 +79,9 @@
+ #ifdef HAVE_LIBXPM
+ #include <X11/xpm.h>
+ #endif
++#ifdef HAVE_LIB_XCURSOR
++#include <X11/Xcursor/Xcursor.h>
++#endif
+ 
+ #ifdef HAVE_LANGINFO_CODESET
+ #include <langinfo.h>
+@@ -866,7 +869,14 @@
+ 		 * 0, 2 a shape, 3 a mask for 2, etc.  <X11/cursorfont.h>
+ 		 * contains defined names for each shape.
+ 		 */
+-		c = XCreateGlyphCursor(dpy,
++		c = XcursorTryShapeCursor(dpy,
++				       myFont.fs->fid, /* source_font */
++				       myFont.fs->fid, /* mask_font */
++				       c_index + 0, /* source_char */
++				       c_index + 1, /* mask_char */
++				       &foreground,
++				       &background);
++		if (c == None) c = XCreateGlyphCursor(dpy,
+ 				       myFont.fs->fid,	/* source_font */
+ 				       myFont.fs->fid,	/* mask_font */
+ 				       c_index + 0,	/* source_char */

gnu/packages/xorg.scm

@@ -6144,12 +6144,15 @@ (define-public xterm
              (string-append "ftp://ftp.invisible-island.net/xterm/"
                             "xterm-" version ".tgz")))
        (sha256
-        (base32 "10lc72spa69n9d7zg9nwhgwz70qzidp5i17jgw3lq3qg1a25sg4n"))))
+        (base32 "10lc72spa69n9d7zg9nwhgwz70qzidp5i17jgw3lq3qg1a25sg4n"))
+       (patches
+         (search-patches "xterm-370-explicit-xcursor.patch"))))
     (build-system gnu-build-system)
     (arguments
      '(#:configure-flags '("--enable-wide-chars" "--enable-load-vt-fonts"
                            "--enable-i18n" "--enable-doublechars"
-                           "--enable-luit" "--enable-mini-luit")
+                           "--enable-luit" "--enable-mini-luit"
+                           "X_EXTRA_LIBS=-lXcursor")
        #:tests? #f                      ; no test suite
        #:phases
        (modify-phases %standard-phases