Add page size system features

Author: RossComputerGuy

src/libstore/globals.cc

@@ -35,6 +35,8 @@
 #include <sys/sysctl.h>
 #endif
 
+#include <sys/auxv.h>
+
 #include "strings.hh"
 
 namespace nix {
@@ -196,6 +198,11 @@ StringSet Settings::getDefaultSystemFeatures()
         features.insert("apple-virt");
     #endif
 
+    unsigned long pgsize = getauxval(AT_PAGESZ);
+    for (; pgsize <= (64 * 1024); pgsize *= 2) {
+        features.insert(fmt("pages-%1%k", pgsize / 1024));
+    }
+
     return features;
 }