diff -ruN libreport-2.1.11/configure libreport-2.1.11.fix/configure
--- libreport-2.1.11/configure	2014-01-08 18:46:48.057001105 +0100
+++ libreport-2.1.11.fix/configure	2014-01-08 18:46:33.880000782 +0100
@@ -17814,7 +17814,8 @@
 AUTOM4TE=${AUTOM4TE-"${am_missing_run}autom4te"}
 
 # Needed by tests/atlocal.in.
-O0CFLAGS=`echo $CFLAGS   | sed 's/-O[0-9] *//' | sed 's/-Werror//'`
+# CFLAGS may contain '-Werror=format-security'
+O0CFLAGS=`echo $CFLAGS   | sed 's/-O[[0-9]] *//' | sed 's/-Werror\(=[^ ]*\)\?//g'`
 
 
 ac_config_headers="$ac_config_headers config.h"
diff -ruN libreport-2.1.11/configure.ac libreport-2.1.11.fix/configure.ac
--- libreport-2.1.11/configure.ac	2013-12-10 10:16:15.000000000 +0100
+++ libreport-2.1.11.fix/configure.ac	2014-01-08 18:46:33.857000781 +0100
@@ -307,7 +307,8 @@
  AC_CONFIG_FILES([tests/Makefile tests/atlocal])
  AM_MISSING_PROG([AUTOM4TE], [autom4te])
 # Needed by tests/atlocal.in.
-AC_SUBST([O0CFLAGS], [`echo $CFLAGS   | sed 's/-O[[0-9]] *//' | sed 's/-Werror//'`])
+# CFLAGS may contain '-Werror=format-security'
+AC_SUBST([O0CFLAGS], [`echo $CFLAGS   | sed 's/-O[[0-9]] *//' | sed 's/-Werror\(=[[^ ]]*\)\?//g'`])
 
 AC_CONFIG_HEADERS([config.h])