On powerpc-darwin, we don't have undwind.h installed which means that the build now fails on the mainline if you install into a clean prefix.
See: <http://gcc.gnu.org/ml/gcc/2005-06/msg01293.html>. -- Summary: [4.1 Regression] Ada does not build into a clean prefix when unwind.h is not installed Product: gcc Version: 4.1.0 Status: UNCONFIRMED Keywords: build Severity: normal Priority: P2 Component: ada AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pinskia at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org GCC target triplet: powerpc-darwin http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22301