Unresolved external references

Hello friends!

Allow me to write a poem.

I'm using:
https://downloads.embarcadero.com/item/24778

to compile:
http://www.packetizer.com/security/sha1/sha1-c.zip

I get:
Error: Unresolved external '_SHA1Reset' referenced from C:\BORLAND\BCC55\BIN\BHAVESH\SHA1-C\SHATEST.OBJ
Error: Unresolved external '_SHA1Input' referenced from C:\BORLAND\BCC55\BIN\BHAVESH\SHA1-C\SHATEST.OBJ
Error: Unresolved external '_SHA1Result' referenced from C:\BORLAND\BCC55\BIN\BHAVESH\SHA1-C\SHATEST.OBJ

If I add:
-u-

To:
bcc32.cfg

I get:
Error: Unresolved external '_main' referenced from C:\BORLAND\BCC55\LIB\C0X32.OBJ

Any Ideas?

I want to think that you've helped me already. So, thank you.

Check out this link for the last error: Unresolved external '_main' referenced from c0x32.obj