diff --git a/configs/debug.toml b/configs/debug.toml
index d07c05c..4e87550 100644
--- a/configs/debug.toml
+++ b/configs/debug.toml
@@ -64,6 +64,7 @@ ccflags = [
     "-mcmodel=large",
     "-D__ELF__",
     "-D__JSIX__",
+    "-D_LIBCPP_HAS_THREAD_API_EXTERNAL",
     "-isystem${source_root}/sysroot/include",
     "-isystem${source_root}/src/libraries/libc/include",
     "--sysroot='${source_root}/sysroot'"
@@ -113,6 +114,7 @@ ccflags = [
     "-mcmodel=large",
     "-D__ELF__",
     "-D__JSIX__",
+    "-D_LIBCPP_HAS_THREAD_API_EXTERNAL",
     "-isystem${source_root}/sysroot/include",
     "-isystem${source_root}/src/libraries/libc/include",
     "--sysroot='${source_root}/sysroot'"
diff --git a/src/libraries/libc/arch/x86_64/init_libc.c b/src/libraries/j6/init.cpp
similarity index 93%
rename from src/libraries/libc/arch/x86_64/init_libc.c
rename to src/libraries/j6/init.cpp
index 3e60dff..21309a5 100644
--- a/src/libraries/libc/arch/x86_64/init_libc.c
+++ b/src/libraries/j6/init.cpp
@@ -8,7 +8,7 @@ static struct j6_init_value *__initv = 0;
 j6_handle_t __handle_sys = j6_handle_invalid;
 j6_handle_t __handle_self = j6_handle_invalid;
 
-void
+extern "C" void
 _get_init(size_t *initc, struct j6_init_value **initv)
 {
 	if (!initc)
@@ -19,8 +19,8 @@ _get_init(size_t *initc, struct j6_init_value **initv)
 		*initv = __initv;
 }
 
-void
-_init_libc(uint64_t *rsp)
+extern "C" void
+_init_libj6(uint64_t *rsp)
 {
 	uint64_t argc = *rsp++;
 	rsp += argc;
diff --git a/src/libraries/j6/module.toml b/src/libraries/j6/module.toml
index 5435d35..b148eb3 100644
--- a/src/libraries/j6/module.toml
+++ b/src/libraries/j6/module.toml
@@ -1,4 +1,4 @@
 name = "j6"
 kind = "lib"
 includes = ["src/libraries/j6/include"]
-sources = ["syscalls.s"]
+sources = ["init.cpp", "syscalls.s"]
diff --git a/src/libraries/libc/arch/x86_64/crt0.s b/src/libraries/libc/arch/x86_64/crt0.s
index 222f599..d059a8b 100644
--- a/src/libraries/libc/arch/x86_64/crt0.s
+++ b/src/libraries/libc/arch/x86_64/crt0.s
@@ -1,17 +1,15 @@
 extern main
 extern exit
-extern _init_libc
+extern _init_libj6
 
 global _start:function (_start.end - _start)
 _start:
 	mov rbp, rsp
 	mov rdi, rsp
-
-	call _init_libc
+	call _init_libj6
 
 	pop rdi
 	mov rsi, rsp
-
 	call main
 
 	mov rdi, rax
diff --git a/src/libraries/libc/module.toml b/src/libraries/libc/module.toml
index a0c8d70..7dd7a5b 100644
--- a/src/libraries/libc/module.toml
+++ b/src/libraries/libc/module.toml
@@ -7,7 +7,6 @@ deps = ["j6"]
 sources = [
 	"arch/x86_64/_Exit.s",
 	"arch/x86_64/crt0.s",
-	"arch/x86_64/init_libc.c",
 	"ctype/isalnum.c",
 	"ctype/isalpha.c",
 	"ctype/isblank.c",