Hello. I try to build zexy from Pd-extended_0.43.4-source.tar.bz2.

.../pd-extended/externals/zexy/
$./autogen.sh
...

$ ./configure --prefix=/opt/pd-externals/zexy
...

$ make
...
CXX ... -o .libs/zexy.pd_linux
.libs/zexy_la-0x2e.o: In function `setup':
/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x2e.c:175: multiple definition of `setup'
.libs/zexy_la-0x260x260x7e.o:/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x260x260x7e.c:298: first defined here
.libs/zexy_la-0x3c0x7e.o: In function `setup':
/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x3c0x7e.c:254: multiple definition of `setup'
.libs/zexy_la-0x260x260x7e.o:/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x260x260x7e.c:298: first defined here
.libs/zexy_la-0x3d0x3d0x7e.o: In function `setup':
/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x3d0x3d0x7e.c:255: multiple definition of `setup'
.libs/zexy_la-0x260x260x7e.o:/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x260x260x7e.c:298: first defined here
.libs/zexy_la-0x3e0x7e.o: In function `setup':
/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x3e0x7e.c:259: multiple definition of `setup'
.libs/zexy_la-0x260x260x7e.o:/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x260x260x7e.c:298: first defined here
.libs/zexy_la-0x7c0x7c0x7e.o: In function `setup':
/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x7c0x7c0x7e.c:273: multiple definition of `setup'
.libs/zexy_la-0x260x260x7e.o:/home/unclechu/.compile_n_build/pd-extended/externals/zexy/src/0x260x260x7e.c:298: first defined here
collect2: error: ld returned 1 exit status

What I'm doing wrong?