Hi

* Place Makefile.psp in the directory src/libmpg123.
* Patch readers.c (present in src/libmpg123) using readers.c.patch
* Place Config.h in directory src/
* cd to src/libmpg123 and do "make -f Makefile.psp install"

Tested on mpg123 1.4.x and psptoolchain rev. 2398

Regards
Bastian