treat empty TZ environment variable as GMT rather than default
[musl] / arch / sh /
drwxr-xr-x   ..
-rw-r--r-- 3551 atomic.h
drwxr-xr-x - bits
-rw-r--r-- 477 crt_arch.h
-rw-r--r-- 290 pthread_arch.h
-rw-r--r-- 727 reloc.h
drwxr-xr-x - src
-rw-r--r-- 2791 syscall_arch.h