diff --git a/acinclude.m4 b/acinclude.m4
index 157ba03edc..abaaf72245 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -14,6 +14,7 @@ sinclude(config/cxx_find_template_repository.m4)
 sinclude(config/cxx_have_exceptions.m4)
 sinclude(config/cxx_find_exception_flags.m4)
 
+sinclude(config/lam_case_sensitive_fs_setup.m4)
 sinclude(config/lam_check_optflags.m4)
 sinclude(config/lam_configure_options.m4)
 sinclude(config/lam_functions.m4)
diff --git a/configure.ac b/configure.ac
index 462aed293d..f72024e682 100644
--- a/configure.ac
+++ b/configure.ac
@@ -180,6 +180,11 @@ AC_DEFINE_UNQUOTED(LAM_WANT_MPI_PROFILING, $WANT_MPI_PROFILING,
 AC_DEFINE_UNQUOTED(LAM_HAVE_WEAK_SYMBOLS, $LAM_C_HAVE_WEAK_SYMBOLS,
     [Wehther we have weak symbols or not])
 
+#################################
+# FILE SYSTEM CASE SENSITIVENESS
+#################################
+
+LAM_CASE_SENSITIVE_FS_SETUP
 
 ##################################
 # C++ compiler characteristics