gnutar: make sure libiconv is linked

gnutar’s `configure` detects libiconv but fails to link it on Darwin.

pkgs/tools/archivers/gnutar/default.nix

@@ -17,12 +17,9 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-TWL/NzQux67XSFNTI5MMfPlKz3HDWRiCsmp+pQ8+3BY=";
   };
 
-  # avoid retaining reference to CF during stdenv bootstrap
-  configureFlags = lib.optionals stdenv.hostPlatform.isDarwin [
-    "gt_cv_func_CFPreferencesCopyAppValue=no"
-    "gt_cv_func_CFLocaleCopyCurrent=no"
-    "gt_cv_func_CFLocaleCopyPreferredLanguages=no"
-  ];
+  # GNU tar fails to link libiconv even though the configure script detects it.
+  # https://savannah.gnu.org/bugs/index.php?64441
+  patches = [ ./link-libiconv.patch ];
 
   # gnutar tries to call into gettext between `fork` and `exec`,
   # which is not safe on darwin.
@@ -33,8 +30,8 @@ stdenv.mkDerivation rec {
 
   outputs = [ "out" "info" ];
 
-  nativeBuildInputs = lib.optional stdenv.hostPlatform.isDarwin autoreconfHook
-    ++ lib.optional (!stdenv.hostPlatform.isDarwin) updateAutotoolsGnuConfigScriptsHook;
+  nativeBuildInputs = [ autoreconfHook ];
+
   # Add libintl on Darwin specifically as it fails to link (or skip)
   # NLS on it's own:
   #  "_libintl_textdomain", referenced from:

pkgs/tools/archivers/gnutar/link-libiconv.patch

@@ -0,0 +1,23 @@
+From 8632df398b2f548465ebe68b8f494c0d6f8d913d Mon Sep 17 00:00:00 2001
+From: Sergey Poznyakoff <gray@gnu.org>
+Date: Tue, 18 Jul 2023 17:02:23 +0300
+Subject: Fix savannah bug #64441
+
+* src/Makefile.am (tar_LDADD): Add libiconv libraries.
+---
+ src/Makefile.am | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/Makefile.am b/src/Makefile.am
+index 36c9543..e2ec58d 100644
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -52,4 +52,5 @@ AM_CFLAGS = $(WARN_CFLAGS) $(WERROR_CFLAGS)
+ tar_LDADD = $(LIBS) ../lib/libtar.a ../gnu/libgnu.a\
+  $(LIB_ACL) $(LIB_CLOCK_GETTIME) $(LIB_EACCESS)\
+  $(LIB_GETRANDOM) $(LIB_HARD_LOCALE) $(FILE_HAS_ACL_LIB) $(LIB_MBRTOWC)\
+- $(LIB_SELINUX) $(LIB_SETLOCALE_NULL)
++ $(LIB_SELINUX) $(LIB_SETLOCALE_NULL) \
++ $(LIBINTL) $(LIBICONV)
+-- 
+cgit v1.1