build problems on libuv5+no_apr_atomic

build-problems.txt

$ perl Configure.pl 
Welcome to MoarVM!

Updating submodules .................................... OK
Configuring native build environment ................... OK

        make: make
     compile: gcc -D_REENTRANT -D_LARGEFILE64_SOURCE -g -Wall -Wextra
        link: gcc  -g
        libs: -lm -lpthread -luuid -lrt

  byte order: little endian

Configuring 3rdparty libs .............................. OK

  3rdparty: 3rdparty/apr/.libs/libapr-1.a
            3rdparty/libatomic_ops/src/libatomic_ops.a
            3rdparty/libtommath/libtommath.a
            3rdparty/libuv/libuv.a
            3rdparty/linenoise/liblinenoise.a
            3rdparty/sha1/libsha1.a

Generating src/gen/config.h ............................ OK
Generating Makefile .................................... OK

Configuration SUCCESS.

Type 'make' to build and 'make help' to see a list of
available make targets.

$ make
compiling src/main.o
compiling src/core/args.o
In file included from src/moarvm.h:35:0,
                 from src/core/args.c:1:
src/core/exceptions.h:68:98: error: unknown type name ‘va_list’
src/core/args.c: In function ‘init_named_used’:
src/core/args.c:3:47: warning: unused parameter ‘tc’ [-Wunused-parameter]
src/core/args.c: In function ‘MVM_args_proc_cleanup_for_cache’:
src/core/args.c:30:56: warning: unused parameter ‘tc’ [-Wunused-parameter]
src/core/args.c: In function ‘MVM_args_slurpy_named’:
src/core/args.c:479:17: warning: statement with no effect [-Wunused-value]
src/core/args.c:483:17: warning: statement with no effect [-Wunused-value]
src/core/args.c:487:17: warning: statement with no effect [-Wunused-value]
src/core/args.c: In function ‘flatten_args’:
src/core/args.c:501:36: warning: unused variable ‘val_info’ [-Wunused-variable]
src/core/args.c:501:26: warning: unused variable ‘key_info’ [-Wunused-variable]
make: *** [src/core/args.o] Error 1