---
 configure    |    1 +
 configure.ac |    1 +
 2 files changed, 2 insertions(+)

--- configure.ac
+++ configure.ac	2016-09-19 08:54:17.383277267 +0000
@@ -2203,6 +2203,7 @@ fi
 use_mmap_for_buffers=no
 case "$opsys" in
   cygwin|mingw32|freebsd|irix6-5) use_mmap_for_buffers=yes ;;
+  gnu-linux) use_mmap_for_buffers=yes ;;
 esac
 
 AC_FUNC_MMAP
--- configure
+++ configure	2016-09-19 08:54:30.971020865 +0000
@@ -11572,6 +11572,7 @@ fi
 use_mmap_for_buffers=no
 case "$opsys" in
   cygwin|mingw32|freebsd|irix6-5) use_mmap_for_buffers=yes ;;
+  gnu-linux) use_mmap_for_buffers=yes ;;
 esac