There are several functions in qjs which are too easy to collide as:

• they are not static
• they are not namespaced with a prefix.

There are two specific offenders I encountered, pstrcat & pstrcpy, both colliding with their equivalent implementations in tinycc. There are few more which have just too much of a generic name, like has_suffix.
All these "offenders" are declared in cutils.h and implemented in cutils.c.

My suggestion would be for these functions to be scoped with some prefix, as I don't think they are really meant to be used from outside qjs.