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

--- configure.ac
+++ configure.ac	2018-05-29 12:18:31.133648098 +0000
@@ -2569,6 +2569,7 @@ fi
 use_mmap_for_buffers=no
 case "$opsys" in
   mingw32) use_mmap_for_buffers=yes ;;
+  gnu-linux) use_mmap_for_buffers=yes ;;
 esac
 
 AC_FUNC_MMAP
--- configure
+++ configure	2018-05-29 12:20:07.583908486 +0000
@@ -13612,6 +13612,7 @@ fi
 use_mmap_for_buffers=no
 case "$opsys" in
   mingw32) use_mmap_for_buffers=yes ;;
+  gnu-linux) use_mmap_for_buffers=yes ;;
 esac