This patch fixes a failing unit test by feeding buildNormalizedPath to the
tzdata properly.  Three other tests are disabled, one assumes /root and the
two others use networking.  Not bad out of almost 700 tests!

by Pjotr Prins <pjotr.guix@thebird.nl>

--- a/std/datetime.d.orig      2016-11-24 01:13:52.584495545 +0100
+++ b/std/datetime.d   2016-11-24 01:17:09.655306728 +0100
@@ -28081,22 +28081,24 @@
         import std.range : retro;
         import std.format : format;

-        name = strip(name);
-
         enforce(tzDatabaseDir.exists(), new DateTimeException(format("Directory %s does not exist.", tzDatabaseDir)));
         enforce(tzDatabaseDir.isDir, new DateTimeException(format("%s is not a directory.", tzDatabaseDir)));

         version(Android)
         {
+            name = strip(name);
             auto tzfileOffset = name in tzdataIndex(tzDatabaseDir);
             enforce(tzfileOffset, new DateTimeException(format("The time zone %s is not listed.", name)));
             string tzFilename = separate_index ? "zoneinfo.dat" : "tzdata";
             immutable file = buildNormalizedPath(tzDatabaseDir, tzFilename);
         }
         else
-            immutable file = buildNormalizedPath(tzDatabaseDir, name);
+        {
+            auto filename = "./" ~ strip(name); // make sure the prefix is not stripped
+            immutable file = buildNormalizedPath(tzDatabaseDir, filename);
+        }

-        enforce(file.exists(), new DateTimeException(format("File %s does not exist.", file)));
+        enforce(file.exists(), new DateTimeException(format("File %s does not exist in %s.", file, tzDatabaseDir)));
         enforce(file.isFile, new DateTimeException(format("%s is not a file.", file)));

         auto tzFile = File(file);
diff --git a/std/path.d b/std/path.d
index 254d8f0..b0fc04d 100644
--- a/std/path.d
+++ b/std/path.d
@@ -3080,8 +3080,11 @@ unittest
         }
         else
         {
+            pragma(msg, "test disabled on GNU Guix");
+/*
             assert(expandTilde("~root") == "/root", expandTilde("~root"));
             assert(expandTilde("~root/") == "/root/", expandTilde("~root/"));
+*/
         }
         assert(expandTilde("~Idontexist/hey") == "~Idontexist/hey");
     }
diff --git a/std/socket.d b/std/socket.d
index b85d1c9..7fbf346 100644
--- a/std/socket.d
+++ b/std/socket.d
@@ -859,6 +862,8 @@ class InternetHost

 unittest
 {
+    pragma(msg, "test disabled on GNU Guix");
+    /*
     InternetHost ih = new InternetHost;

     ih.getHostByAddr(0x7F_00_00_01);
@@ -889,6 +894,7 @@ unittest
         //      writefln("aliases[%d] = %s", i, s);
         // }
     });
+    */
 }