Squashed 'third_party/gperftools/' content from commit 54505f1

Change-Id: Id02e833828732b0efe7dac722b8485279e67c5fa
git-subtree-dir: third_party/gperftools
git-subtree-split: 54505f1d50c2d1f4676f5e87090b64a117fd980e
diff --git a/m4/install_prefix.m4 b/m4/install_prefix.m4
new file mode 100644
index 0000000..ef33f42
--- /dev/null
+++ b/m4/install_prefix.m4
@@ -0,0 +1,8 @@
+AC_DEFUN([AC_INSTALL_PREFIX],
+  [ac_cv_install_prefix="$prefix";
+   if test x"$ac_cv_install_prefix" = x"NONE" ; then
+     ac_cv_install_prefix="$ac_default_prefix";
+   fi
+   AC_DEFINE_UNQUOTED(INSTALL_PREFIX, "$ac_cv_install_prefix",
+     [prefix where we look for installed files])
+   ])