OK, so -noixemul prevents linking to the ixemul library... so I assume this is only useful to projects that are porting Posix software? Or is it broader than that? Also, that Libnix reference in LIBS... is that a reference to ixemul? Or an alternate? What's it's purpose?
I believe libnix is an alternative to ixemul. Ixemul.library is loaded at runtime from LIBS. libnix.a is statically linked at compile time. They both provide C runtime library functions like malloc, fopen, strcpy, etc.
Libnix:
http://sourceforge.net/projects/libnix/ Ixemul.library:
http://amiga.svn.sourceforge.net/viewvc/amiga/ixemul/