What is '_Sxtcp_connect_0' in UDP application?

[jsgn3]

I am developing a UDP application with uses amongst other
the library lib_xtcp (4.0.1). When I compile the program
this call causes an error:

---
xtcp_connect(c_xtcp,
BROADCAST_PORT,
broadcast_addr,
XTCP_PROTOCOL_UDP);
---

The error is:

---
Compiling tcp_reflect.xc
Rebuild .build/_obj.rsp
Creating Gigabit.xe
../src/tcp_reflect.xc: Error: Undefined reference to '_Sxtcp_connect_0'
---

I have no single clue about what ''_Sxtcp_connect_0" is. I found it nowhere
in the software, libraries or on the internet, for that matter.

Any idea what ''_Sxtcp_connect_0" is and how to solve this error?

[akp]

Did you clean the project prior to build? Errors like this can show up if you don't.

[jsgn3]

Yes, I did.

[CousinItt]

Note the current revision of lib_xtcp is 6.0.0. Have you included a link to the library in your makefile?

[jsgn3]

Note the current revision of lib_xtcp is 6.0.0. Have you included a link to the library in your makefile?

I used an example which needs 4.0.1. So I do not link to 6.0.0.

Because of the problems we have with all this we decided to go
for an FPGA.