binutils-2.31.1/config.sub
	replace line 1379 with
	"	     | midnightbsd* | essence*)"

binutils-2.31.1/bfd/config.bfd
	replace line 665 with
	"  x86_64-*-elf* | x86_64-*-rtems* | x86_64-*-fuchsia | x86_64-*-essence)"

binutils-2.31.1/gas/configure.tgt
	insert after line 215
	"  i386-*-essence*)			fmt=elf ;;"

binutils-2.31.1/ld/configure.tgt
	replace line 308 with
	"x86_64-*-elf* | x86_64-*-rtems* | x86_64-*-fuchsia* | x86_64-*-essence*)"
	insert after line 780
	"*-*-essence*)"
	"  NATIVE_LIB_DIRS='/Programs/POSIX/lib'"
	"  ;;"
	""

gcc-8.2.0/config.sub
	replace line 1419 with
	"	      | -onefs* | -tirtos* | -phoenix* | -fuchsia* | -redox* | -bme* | -essence*)"

gcc-8.2.0/gcc/config.gcc
	insert after line 698
	"*-*-essence*)"
	"  gas=yes"
	"  gnu_ld=yes"
	"  native_system_header_dir=/Programs/POSIX/include"
	"  ;;"
	insert after line 1504
	"x86_64-*-essence*)"
	"	tmake_file="${tmake_file} i386/t-x86_64-essence""
	"	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h essence.h""
	"	;;"

gcc-8.2.0/gcc/config/i386/t-x86_64-essence
	create new file
***
MULTILIB_OPTIONS += mno-red-zone
MULTILIB_DIRNAMES += no-red-zone
***

gcc-8.2.0/gcc/config/essence.h
	create new file
***
#undef TARGET_ESSENCE
#define TARGET_ESSENCE 1
/* Default arguments to ld */
#undef LIB_SPEC
#define LIB_SPEC "-lapi --start-group -lglue -lc --end-group -z max-page-size=0x1000"
/* Files that are linked before user code. The %s tells GCC to look for these files in the library directory. */
#undef STARTFILE_SPEC
#define STARTFILE_SPEC "crti.o%s crtbegin.o%s"
/* Files that are linked after user code. */
#undef ENDFILE_SPEC
#define ENDFILE_SPEC "crtend.o%s crtn.o%s"
/* Additional predefined macros. */
#undef TARGET_OS_CPP_BUILTINS
#define TARGET_OS_CPP_BUILTINS()      \
  do {                                \
    builtin_define ("ARCH_64");      \
    builtin_define ("ARCH_X86_64");      \
    builtin_define ("ARCH_X86_COMMON");      \
    builtin_define ("OS_ESSENCE");      \
  } while(0)
***

gcc-8.2.0/libgcc/config.host
	insert after line 617
	"x86_64-*-essence)"
	"	extra_parts="$extra_parts crti.o crtbegin.o crtend.o crtn.o""
	"	tmake_file="$tmake_file i386/t-crtstuff t-crt-stuff-pic -t-libgcc-pic""
	"	;;"

gcc-8.2.0/fixincludes/mkfixinc.sh
	insert after line 13
	"    *-essence* | \"

gcc-8.2.0/libstdc++-v3/configure
	"  *-essence*)"
	""
	"    ;;"
	and 
  essence*)
    lt_cv_dlopen="dlopen"
    lt_cv_dlopen_libs=
    ;;

(then build according to https://wiki.osdev.org/Hosted_GCC_Cross-Compiler)