better flag variable assignment

diff --git a/expat/configure.ac b/expat/configure.ac
index 20d894d0a70be24965817868ef8fed80d348528f..ab4ea5a4e4d9023866ba841260261ae60eba2262 100644 (file)
--- a/expat/configure.ac
+++ b/expat/configure.ac
@@ -50,7 +50,7 @@ LIBCURRENT=7   # sync
 LIBREVISION=8  # with
 LIBAGE=6       # CMakeLists.txt!
 
-AS_VAR_APPEND(CPPFLAGS," -DHAVE_EXPAT_CONFIG_H")
+AX_APPEND_FLAG([-DHAVE_EXPAT_CONFIG_H], [CPPFLAGS])
 AC_CONFIG_HEADER([expat_config.h])
 
 AM_PROG_AR