support mac builds

DNO-96 #done

Change-Id: I6f058706b720efe0fc52235b31d7efc15efeb678
diff --git a/libipt/BUILD.gn b/libipt/BUILD.gn
index 58f0932..c35763b 100644
--- a/libipt/BUILD.gn
+++ b/libipt/BUILD.gn
@@ -62,7 +62,7 @@
     "src/pt_block_cache.c",
   ]
 
-  if (is_linux) {
+  if (is_linux || is_mac) {
     sources += [
       "internal/include/posix/pt_section_posix.h",
       # IWBN to include init.c but we're building a static library,
@@ -81,7 +81,7 @@
     "internal/include",
   ]
 
-  if (is_linux) {
+  if (is_linux || is_mac) {
     include_dirs += [
       "internal/include/posix",
     ]