--- a/src/configure.ac
+++ b/src/configure.ac
@@ -155,6 +155,17 @@
AC_DEFINE(RCL_ICONV_INBUF_CONST, 1, [iconv parameter 2 is const char**])
fi
+
+AC_MSG_CHECKING(for type of string parameter to putenv)
+AC_TRY_COMPILE([
+ #include <stdlib.h>
+ ],[
+ putenv((const char *)0);
+ ], rcl_putenv_string_const="1", rcl_putenv_string_const="0")
+if test X$rcl_putenv_string_const = X1 ; then
+ AC_DEFINE(PUTENV_ARG_CONST, 1, [putenv parameter is const])
+fi
+
#### Look for Xapian
AC_PATH_PROG(XAPIAN_CONFIG, xapian-config, no)
if test "$XAPIAN_CONFIG" = "no" ; then