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

--- configure.ac
+++ configure.ac	2017-02-27 14:03:47.908816992 +0000
@@ -2197,6 +2197,7 @@ 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	2017-02-27 14:03:47.912816917 +0000
@@ -11576,6 +11576,7 @@ 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