APR-1.2.7 compiles fine on SkyOS, no patches needed this time.
However apr-util-1.2.7 does not compile due to an outdated config.sub and config.guess file.
It's strange though since both have the same version.
Apr-util reports it does not know build system type i586-pc-skyos.
I downloaded these newer versions and now apr-util configures without a problem on this system:
Please update these files in the next releases