Description:
make[1]: Leaving directory '/build/bird/src/bird-1.4.0/_build4/proto/static'
make[1]: Entering directory '/build/bird/src/bird-1.4.0/_build4/client'
gcc -I../ -I../.. -D_FORTIFY_SOURCE=2 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -pthread -o birdc.o -c ../../client/birdc.c
gcc -I../ -I../.. -D_FORTIFY_SOURCE=2 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -pthread -o birdcl.o -c ../../client/birdcl.c
gcc -I../ -I../.. -D_FORTIFY_SOURCE=2 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -pthread -o commands.o -c ../../client/commands.c
gcc -I../ -I../.. -D_FORTIFY_SOURCE=2 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -pthread -o util.o -c ../../client/util.c
gcc -I../ -I../.. -D_FORTIFY_SOURCE=2 -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector --param=ssp-buffer-size=4 -pthread -o client.o -c ../../client/client.c
../../client/birdc.c:32:1: error: unknown type name 'Function'
extern Function *rl_last_func;
^
../../client/birdc.c:32:18: error: conflicting types for 'rl_last_func'
extern Function *rl_last_func;
^
In file included from ../../client/birdc.c:14:0:
/usr/include/readline/readline.h:544:27: note: previous declaration of 'rl_last_func' was here
extern rl_command_func_t *rl_last_func;
^
../../client/birdc.c: In function 'input_complete':
../../client/birdc.c:85:20: warning: comparison of distinct pointer types lacks a cast [enabled by default]
if (rl_last_func != input_complete)
^
../Rules:76: recipe for target 'birdc.o' failed
make[1]: *** [birdc.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/build/bird/src/bird-1.4.0/_build4/client'
Makefile:36: recipe for target 'subdir' failed
make: *** [subdir] Error 2
==> ERROR: A failure occurred in build().
Aborting...

Steps to reproduce:
sudo extra-x86_64-build