diff --git a/src/config.mk.in b/src/config.mk.in
index 1a44f80c9..e8a8ab567 100644
--- a/src/config.mk.in
+++ b/src/config.mk.in
@@ -10,6 +10,7 @@ libdir = @libdir@
 datadir = @datadir@
 
 host = @host@
+build = @build@
 
 GHCFLAGS = @GHCFLAGS@
 CPPFLAGS = @CPPFLAGS@