m4: use a safer pattern to enable/disable output

[bison.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index 955f56ef790afaf18d96dd625e155d2ea9c1af29..83e20acb01ade45da8f32b2fd046315dd6bd1a16 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -114,6 +114,7 @@ fi
 
 BISON_TEST_FOR_WORKING_C_COMPILER
 BISON_TEST_FOR_WORKING_CXX_COMPILER
+BISON_C_COMPILER_POSIXLY_CORRECT
 
 AC_ARG_ENABLE([yacc],
   [AC_HELP_STRING([--disable-yacc],