`python3 -m pip install pycurl` fails due to glibc not being able to find
the header "linux/limits.h".  I am aware that there is a "python-pycurl"
package in guix, but the above should still work.  I think glibc is missing
a dependency on linux headers, but I'm not sure that all this is
actionable.  Should I be opening up a bug report for this?