diff --git a/gconfig/UNIX.mk b/gconfig/UNIX.mk
index e7ed8f8f46df..cc9f032b952b 100644
--- a/gconfig/UNIX.mk
+++ b/gconfig/UNIX.mk
@@ -51,6 +51,7 @@ NATIVE_RAPTOR_GFX = gfxunix
 NATIVE_RAPTOR_WEB=raptorwebwidget
 RAPTOR_GFX=raptorgfx
 NATIVE_SMTP_LIB=smtp
+NATIVE_MSG_COMM_LIB=comm
 NATIVE_JULIAN_DLL=julian
 PLATFORM_DIRECTORY=unix
 NATIVE_ZLIB_DLL=zlib
diff --git a/gconfig/WIN32.mk b/gconfig/WIN32.mk
index ef6306b6a0e0..36763706b5ae 100644
--- a/gconfig/WIN32.mk
+++ b/gconfig/WIN32.mk
@@ -52,6 +52,7 @@ NATIVE_RAPTOR_WIDGET =
 NATIVE_RAPTOR_GFX = raptorgfxwin
 NATIVE_RAPTOR_WEB=raptorweb
 NATIVE_SMTP_LIB=libsmtp
+NATIVE_MSG_COMM_LIB=libcomm
 RAPTOR_GFX=
 VERSION_NUMBER=50
 NATIVE_JULIAN_DLL=jul$(MOZ_BITS)$(VERSION_NUMBER)