https://bugs.gentoo.org/832563
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,7 @@ dnl Support "--enable-debug=..." configure script command line option.
 AX_IS_RELEASE([git-directory])
 AX_CHECK_ENABLE_DEBUG([yes])
 
-AM_INIT_AUTOMAKE([1.15 -Wall -Werror -Wno-portability silent-rules std-options check-news])
+AM_INIT_AUTOMAKE([1.15 -Wall -Wno-portability silent-rules std-options check-news])
 AM_SILENT_RULES([yes])
 LT_INIT([disable-static])
 
@@ -301,7 +301,7 @@ LIBS=$mptcpd_save_libs
 # warning free.
 # ---------------------------------------------------------------
 AX_CFLAGS_WARN_ALL([CFLAGS])
-AX_APPEND_COMPILE_FLAGS([-Wextra -Werror -pedantic])
+AX_APPEND_COMPILE_FLAGS([-Wextra -pedantic])
 
 # ---------------------------------------------------------------
 # Enable compile-time defense