diff --git a/modules/proxy/config.m4 b/modules/proxy/config.m4
index 5ebff3b1fc..25309212c3 100644
--- a/modules/proxy/config.m4
+++ b/modules/proxy/config.m4
@@ -42,7 +42,14 @@ APACHE_MODULE(proxy_ftp, Apache proxy FTP module, $proxy_ftp_objs, , $proxy_mods
 APACHE_MODULE(proxy_http, Apache proxy HTTP module, $proxy_http_objs, , $proxy_mods_enable)
 APACHE_MODULE(proxy_fcgi, Apache proxy FastCGI module, $proxy_fcgi_objs, , $proxy_mods_enable)
 APACHE_MODULE(proxy_scgi, Apache proxy SCGI module, $proxy_scgi_objs, , $proxy_mods_enable)
-APACHE_MODULE(proxy_fdpass, Apache proxy to Unix Daemon Socket module, $proxy_fdpass_objs, , $proxy_mods_enable)
+APACHE_MODULE(proxy_fdpass, Apache proxy to Unix Daemon Socket module, $proxy_fdpass_objs, , $proxy_mods_enable, [
+  AC_CHECK_DECLS(CMSG_DATA, [ap_HAVE_DECL_CMSG_DATA="yes"], [ap_HAVE_DECL_CMSG_DATA="no"], [[#include <sys/socket.h>]])
+  if test $ap_HAVE_DECL_CMSG_DATA = "no"; then
+    AC_MSG_WARN([Your system does not support CMSG_DATA.])
+    enable_proxy_fdpass="no"
+    _apmod_error_fatal="no"
+  fi
+])
 APACHE_MODULE(proxy_ajp, Apache proxy AJP module, $proxy_ajp_objs, , $proxy_mods_enable)
 APACHE_MODULE(proxy_balancer, Apache proxy BALANCER module, $proxy_balancer_objs, , $proxy_mods_enable)
 
diff --git a/modules/proxy/mod_proxy_fdpass.c b/modules/proxy/mod_proxy_fdpass.c
index cf66579d07..7396677bf9 100644
--- a/modules/proxy/mod_proxy_fdpass.c
+++ b/modules/proxy/mod_proxy_fdpass.c
@@ -16,14 +16,14 @@
 
 #include "mod_proxy.h"
 
-#ifndef CMSG_DATA
-#error This module only works on unix platforms with the correct OS support
-#endif
-
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 
+#ifndef CMSG_DATA
+#error This module only works on unix platforms with the correct OS support
+#endif
+
 /* for apr_wait_for_io_or_timeout */
 #include "apr_support.h"