How to compile standalone UnrealEngine 4.12 server for Ubuntu 16.

/home/root2/UE/crosstool-ng/kconfig/zconf.hash.c 
line 145
//#if defined __GNUC_STDC_INLINE__ // || defined __GNUC_GNU_INLINE__
#ifdef __GNUC_STDC_INLINE__
__attribute__ ((__gnu_inline__))
#endif