Log message:
Correct resolver prototypes. Add strto(u)ll glue. Provide inlined setenv(3)

Log message:
Add missing resolver prototypes.

Log message:
tidy up loop

Log message:
When we're substituting a system-provided header file, use the C
preprocessor to find out the absolute path of the system header, so that
we may include it before we add our customizations.
This is especially important when using gcc, due to it's "fixincludes".
For example, <math.h> might not be /usr/include/math.h, but instead
something like /path/to/gcc/lib/gcc/${MACHINE_GNU_PLATFORM}/include/math.h.

Log message:
Add pkgtools/posix_headers version 0.4:
This package attempts to resolve deficiencies in system headers.
These deficiencies are commonly found on older operating system releases.
When use of posix_headers has been enabled on a platform, this package will
become a compile-time dependency for every package. It will provide customized
header files that take preference over some system provided ones (that may
not even exist). This happens transparently through use of buildlink3.