Function 'strptime' does not exist in module 'Glibc'?

i am trying to parse some ISO-8601 timestamps (2023-09-25T14:47:10Z) on a server, which means no Foundation.

for some reason, i am unable to import the strptime(_:_:_:) function from glibc.

#if canImport(Glibc)
import func Glibc.strptime
#else
error: function 'strptime' does not exist in module 'Glibc'

how do i get strptime?