In preparation for adding user mode emulation support for the
Linux usbfs interface, check for its kernel header.

Signed-off-by: Cortland Tölva <cst@tolva.net>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180925071228.32040-2-cst@tolva.net>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 configure | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index f89d293585..19d66bbdeb 100755
--- a/configure
+++ b/configure
@@ -4236,7 +4236,14 @@ if compile_prog "" "" ; then
   memfd=yes
 fi
 
-
+# check for usbfs
+have_usbfs=no
+if test "$linux_user" = "yes"; then
+  if check_include linux/usbdevice_fs.h; then
+    have_usbfs=yes
+  fi
+  have_usbfs=yes
+fi
 
 # check for fallocate
 fallocate=no
@@ -6350,6 +6357,9 @@ fi
 if test "$memfd" = "yes" ; then
   echo "CONFIG_MEMFD=y" >> $config_host_mak
 fi
+if test "$have_usbfs" = "yes" ; then
+  echo "CONFIG_USBFS=y" >> $config_host_mak
+fi
 if test "$fallocate" = "yes" ; then
   echo "CONFIG_FALLOCATE=y" >> $config_host_mak
 fi
-- 
2.11.0