http://lists.boost.org/Archives/boost/2015/02/220155.php

commit d19baee73f90de01375af69a9f8621799c649964
Author: Edward Nevill <edward.nevill_at_[hidden]>
Date: Mon Feb 23 17:32:49 2015 +0000

    Fix build for aarch64.


Index: boost_1_57_0/libs/context/build/Jamfile.v2
===================================================================
--- boost_1_57_0.orig/libs/context/build/Jamfile.v2
+++ boost_1_57_0/libs/context/build/Jamfile.v2
@@ -214,7 +214,7 @@ alias asm_context_sources
 alias asm_context_sources
    : [ make asm/make_arm64_aapcs_elf_gas.o : asm/make_arm64_aapcs_elf_gas.S : @gas64 ]
      [ make asm/jump_arm64_aapcs_elf_gas.o : asm/jump_arm64_aapcs_elf_gas.S : @gas64 ]
-   : <abi>aapcs
+   : <abi>sysv
      <address-model>64
      <architecture>arm
      <binary-format>elf
@@ -223,7 +223,7 @@ alias asm_context_sources
 alias asm_context_sources
    : asm/make_arm64_aapcs_elf_gas.S
      asm/jump_arm64_aapcs_elf_gas.S
-   : <abi>aapcs
+   : <abi>sysv
      <address-model>64
      <architecture>arm
      <binary-format>elf
@@ -233,7 +233,7 @@ alias asm_context_sources
 alias asm_context_sources
    : asm/make_arm64_aapcs_elf_gas.S
      asm/jump_arm64_aapcs_elf_gas.S
-   : <abi>aapcs
+   : <abi>sysv
      <address-model>64
      <architecture>arm
      <binary-format>elf