Makefile | 30 15 + 15 - 0 !
1 file changed, 15 insertions(+), 15 deletions(-)

 enable the passing of extra compilation flags, for hardening

Makefile | 33 19 + 14 - 0 !
1 file changed, 19 insertions(+), 14 deletions(-)

 make build reproducible

hisat2 | 2 1 + 1 - 0 !
1 file changed, 1 insertion(+), 1 deletion(-)

 identify *freebsd as a unix-like os
 Match "gnukfreebsd" or "freebsd", when assigning $os_is_nix. Fixes
 build on *FreeBSD.

Makefile | 14 7 + 7 - 0 !
1 file changed, 7 insertions(+), 7 deletions(-)

 remove restrictive compiler flags