[PATCH 2/4] AC_PROG_LEX: Rephrase LEX is set test

[Bernhard Reutner-Fischer]

2015-04-08  Bernhard Reutner-Fischer  <rep.dot....@gmail.com>

        * lib/autoconf/programs.m4 (AC_PROG_LEX): Rephrase LEX is set
        test.

Signed-off-by: Bernhard Reutner-Fischer <rep.dot....@gmail.com>
---
 lib/autoconf/programs.m4 |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/autoconf/programs.m4 b/lib/autoconf/programs.m4
index 931177b..abf554c 100644
--- a/lib/autoconf/programs.m4
+++ b/lib/autoconf/programs.m4
@@ -709,7 +709,7 @@ AN_PROGRAM([lex],  [AC_PROG_LEX])
 AN_PROGRAM([flex], [AC_PROG_LEX])
 AC_DEFUN_ONCE([AC_PROG_LEX],
 [AC_CHECK_PROGS(LEX, flex lex, :)
-if test "x$LEX" != "x:"; then
+if [[ ${LEX:+y} ]]; then
   _AC_PROG_LEX_YYTEXT_DECL
 fi])
 
-- 
1.7.10.4