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-rw-r--r--tool/m4/ruby_check_sysconf.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/m4/ruby_check_sysconf.m4 b/tool/m4/ruby_check_sysconf.m4
index 7e5d72d426..f6b247a16f 100644
--- a/tool/m4/ruby_check_sysconf.m4
+++ b/tool/m4/ruby_check_sysconf.m4
@@ -1,3 +1,4 @@
+# -*- Autoconf -*-
AC_DEFUN([RUBY_CHECK_SYSCONF], [dnl
AC_CACHE_CHECK([whether _SC_$1 is supported], rb_cv_have_sc_[]m4_tolower($1),
[AC_TRY_COMPILE([#include <unistd.h>