diff --git a/gconfig/UNIX.mk b/gconfig/UNIX.mk
index b7f9b8b30ff..e7ed8f8f46d 100644
--- a/gconfig/UNIX.mk
+++ b/gconfig/UNIX.mk
@@ -50,6 +50,7 @@ NATIVE_RAPTOR_WIDGET = widgetunix
 NATIVE_RAPTOR_GFX = gfxunix
 NATIVE_RAPTOR_WEB=raptorwebwidget
 RAPTOR_GFX=raptorgfx
+NATIVE_SMTP_LIB=smtp
 NATIVE_JULIAN_DLL=julian
 PLATFORM_DIRECTORY=unix
 NATIVE_ZLIB_DLL=zlib
diff --git a/gconfig/WIN32.mk b/gconfig/WIN32.mk
index eef6abc671c..ef6306b6a0e 100644
--- a/gconfig/WIN32.mk
+++ b/gconfig/WIN32.mk
@@ -51,6 +51,7 @@ NATIVE_PLATFORM=win
 NATIVE_RAPTOR_WIDGET =
 NATIVE_RAPTOR_GFX = raptorgfxwin
 NATIVE_RAPTOR_WEB=raptorweb
+NATIVE_SMTP_LIB=libsmtp
 RAPTOR_GFX=
 VERSION_NUMBER=50
 NATIVE_JULIAN_DLL=jul$(MOZ_BITS)$(VERSION_NUMBER)