Work around parallel building issue on APFS https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797 --- libstdc++-v3/include/Makefile.in.orig 2017-07-25 14:05:07.000000000 -0400 +++ libstdc++-v3/include/Makefile.in 2017-09-02 12:22:08.000000000 -0400 @@ -1764,6 +1764,8 @@ @GLIBCXX_HOSTED_TRUE@install-data-local: install-headers @GLIBCXX_HOSTED_FALSE@install-data-local: install-freestanding-headers +.NOTPARALLEL: install-headers + # This is a subset of the full install-headers rule. We only need , # , , , , , , , # , , , , ,