[PATCH xgc] configure: look for gram.c in $srcdir

[Julien Cristau]

That's where it is when building from the tarball.  Regression from
ff668395fc408f540604bd534e323b483f52a4ea.
---
 configure.ac |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 04f55f6..66560f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,7 +40,7 @@ XORG_DEFAULT_OPTIONS
 AC_PROG_LEX
 AC_PROG_YACC
 AC_PATH_PROG([YACC_INST], $YACC)
-if test ! -f "gram.c"; then
+if ! test -f "$srcdir/gram.c"; then
    if test -z "$YACC_INST"; then
       AC_MSG_ERROR([yacc not found - unable to compile gram.y])
    fi
-- 
1.7.10.4