Dear PPL developers,
The PPL library requires a recent version of GNU m4, but this isn't documented anywhere as far as I can tell, certainly not here: http://bugseng.com/products/ppl/requirements http://bugseng.com/products/ppl/portability
In particular, it fails to configure on OS X 10.4:
$ ./configure checking build system type... powerpc-apple-darwin8.11.0 checking host system type... powerpc-apple-darwin8.11.0 [...] checking for GNU M4 that supports accurate traces... configure: error: no acceptable m4 could be found in $PATH. GNU M4 1.4.5 or later is required; 1.4.11 is recommended
$ m4 --version GNU m4 1.4.2
Do the m4-generated files depend on the architecture? If not, you could simply ship them with PPL and not require m4.
Saluti, Jeroen.