diff -uNr gcc-6.4.0.orig/libstdc++-v3/include/Makefile.in gcc-6.4.0/libstdc++-v3/include/Makefile.in --- gcc-6.4.0.orig/libstdc++-v3/include/Makefile.in 2016-10-03 10:36:13.000000000 -0400 +++ gcc-6.4.0/libstdc++-v3/include/Makefile.in 2017-09-02 18:14:56.000000000 -0400 @@ -1745,6 +1745,8 @@ @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 , # , , , , , , , # , , , , ,