xrootd: Add patch for missing <utility> include

science/xrootd/Portfile

@@ -9,7 +9,7 @@ PortGroup           legacysupport               1.0
 
 github.setup        xrootd xrootd 4.9.1 v
 version             ${github.version}
-revision            2
+revision            3
 
 livecheck.version   ${version}
 livecheck.type      regex
@@ -51,6 +51,12 @@ default_variants    +ssl +readline +kerberos
 
 cmake.out_of_source yes
 
+patch.pre_args      -p1
+
+# Temporary fix for missing <utility> include
+# https://github.com/xrootd/xrootd/pull/958
+patchfiles-append   XrdClBuffer-include-utility.patch
+
 # Force a compatible compiler
 compiler.blacklist-append *gcc* {clang < 900} macports-clang-3.3 macports-clang-3.4 \
                            macports-clang-3.7 macports-clang-4.0 macports-clang-3.9 \

science/xrootd/files/XrdClBuffer-include-utility.patch

@@ -0,0 +1,12 @@
+diff --git a/src/XrdCl/XrdClBuffer.hh b/src/XrdCl/XrdClBuffer.hh
+index fbd035a6..4f437d3a 100644
+--- a/src/XrdCl/XrdClBuffer.hh
++++ b/src/XrdCl/XrdClBuffer.hh
+@@ -24,6 +24,7 @@
+ #include <new>
+ #include <cstring>
+ #include <string>
++#include <utility>
+
+ namespace XrdCl
+ {