build: ensure m4 sub-directory is created

Ensure autogen.sh creates the m4 sub-directory before running
autoreconf, otherwise autotools fails.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/autogen.sh b/autogen.sh
index c017353..8460a76 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -9,6 +9,7 @@ test -z "$srcdir" && srcdir=.
 ORIGDIR=`pwd`
 cd $srcdir
 
+mkdir -p $srcdir/m4
 autoreconf --install || exit 1
 
 cd $ORIGDIR || exit $?