Check GCC version #20

Job	Run time
build-test-install (ubuntu, gcc, 1)	11s
build-test-install (ubuntu, gcc, 2)	16s
build-test-install (ubuntu, gcc, 3)	17s
build-test-install (ubuntu, gcc, 4)	13s
build-test-install (ubuntu, gcc, 5)	11s
build-test-install (ubuntu, gcc, 6)	15s
build-test-install (ubuntu, clang, 1)	1m 37s
build-test-install (ubuntu, clang, 2)	1m 44s
build-test-install (ubuntu, clang, 3)	1m 38s
build-test-install (ubuntu, clang, 4)	1m 24s
build-test-install (ubuntu, clang, 5)	1m 30s
build-test-install (ubuntu, clang, 6)	1m 42s
build-test-install (macos, gcc, 1)	50s
build-test-install (macos, gcc, 2)	47s
build-test-install (macos, gcc, 3)	58s
build-test-install (macos, gcc, 4)	44s
build-test-install (macos, gcc, 5)	45s
build-test-install (macos, gcc, 6)	52s
build-test-install (macos, clang, 1)	1m 14s
build-test-install (macos, clang, 2)	1m 22s
build-test-install (macos, clang, 3)	1m 26s
build-test-install (macos, clang, 4)	2m 27s
build-test-install (macos, clang, 5)	2m 37s
build-test-install (macos, clang, 6)	1m 21s
	26m 21s

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