Dist these two files too
diff --git a/Makefile.am b/Makefile.am
index a9f5db1..01d2fdf 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -68,6 +68,8 @@
 	utils/CMakeLists.txt					\
 	CMakeLists.txt						\
 	ConfigureChecks.cmake					\
+	cmake/modules/CheckFileOffsetBits.c			\
+	cmake/modules/CheckFileOffsetBits.cmake			\
 	cmake/modules/COPYING-CMAKE-SCRIPTS			\
 	cmake/modules/FindCairo.cmake				\
 	cmake/modules/FindFontconfig.cmake			\