https://bugzilla.redhat.com/show_bug.cgi?id=862160
--- Comment #11 from Sebastian Dyroff fedora@dyroff.org --- It was getpid.
Error message was:
utils/vk_utils.cpp: In function 'void vkPrint(const char*, ...)': utils/vk_utils.cpp:54:104: error: 'getpid' was not declared in this scope utils/vk_utils.cpp: In function 'void vkPrintErr(const char*, ...)': utils/vk_utils.cpp:68:104: error: 'getpid' was not declared in this scope utils/vk_utils.cpp: In function 'void vkDebug(const char*, ...)': utils/vk_utils.cpp:83:104: error: 'getpid' was not declared in this scope