``` checking net/if.h presence... yes configure: WARNING: net/if.h: present but cannot be compiled configure: WARNING: net/if.h: check for missing prerequisite headers? configure: WARNING: net/if.h: see the Autoconf documentation configure: WARNING: net/if.h: section "Present But Cannot Be Compiled" configure: WARNING: net/if.h: proceeding with the compiler's result checking for net/if.h... no ``` Looks like that got introduced in 9f06ec0c13f0b25ce3bb2c0c352edb04083dbe2c