--- a/CMakeLists.txt	Sat Jul 22 12:47:32 2017 -0400
+++ b/CMakeLists.txt	Sat Jul 22 12:55:50 2017 -0400
@@ -67,6 +67,7 @@
     src/platform_unix.c
     src/platform_macosx.c
     src/platform_windows.c
+    src/platform_os2.c
     src/archiver_dir.c
     src/archiver_unpacked.c
     src/archiver_grp.c