[ must be quoted by [ ...

[rrdtool.git] / acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
index 0338264..6243c21 100644 (file)
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -38,7 +38,7 @@ AC_DEFUN([EX_CHECK_ALL],
             dnl remove the cached value and test again
             unset ac_cv_lib_$1_$2
              AC_CHECK_LIB($1,$2,[
-                unset ac_cv_header_`echo $3 | sed "s/[^A-Za-z]/_/g"`
+                unset ac_cv_header_`echo $3 | sed  sed ['s/[^a-zA-Z0-9_]/_/g;s/^[0-9]/_/']`
                 AC_CHECK_HEADER($3,[EX_CHECK_STATE=YES],[])
             ],[])
           else