--- a/configure.ac+++ b/configure.ac@@ -150,7 +150,6 @@ AC_EXEEXTAC_PROG_LIBTOOL
dnl when using libtool 2.x create libtool early, because it's used in configure
m4_ifdef([LT_OUTPUT], [LT_OUTPUT])
-DOLTdnl Checks for header files.
AC_CHECK_HEADERS(sys/mman.h)