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ok, found
I have to disable ipv6 and install libasan
./python -E -S -m sysconfig --generate-posix-vars ;\
if test $? -ne 0 ; then \
	echo "generate-posix-vars failed" ; \
	rm -f ./pybuilddir.txt ; \
	exit 1 ; \
fi
=================================================================
==5408==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 34 byte(s) in 1 object(s) allocated from:
 #0 0x7fb085e03c08 in __interceptor_malloc (/lib64/libasan.so.5+0xefc08)
 #1 0x4d99a2 in _PyMem_RawMalloc Objects/obmalloc.c:99
 #2 0x4d9b4a in _PyMem_DebugRawAlloc Objects/obmalloc.c:2020
 #3 0x4d9ba5 in _PyMem_DebugRawMalloc Objects/obmalloc.c:2049
 #4 0x4dc354 in PyMem_RawMalloc Objects/obmalloc.c:527
 #5 0x4dc510 in _PyMem_RawStrdup Objects/obmalloc.c:613
 #6 0x652f5f in get_ctype_locale Python/preconfig.c:483
 #7 0x6560a6 in _PyPreConfig_Read Python/preconfig.c:506
 #8 0x616cde in _PyCoreConfig_ReadPreConfig Python/coreconfig.c:1342
 #9 0x620564 in _PyCoreConfig_Read Python/coreconfig.c:1378
 #10 0x65ef06 in pyinit_coreconfig Python/pylifecycle.c:740
 #11 0x65fa05 in _Py_InitializeCore Python/pylifecycle.c:786
 #12 0x42abba in pymain_init Modules/main.c:370
 #13 0x42addc in pymain_main Modules/main.c:889
 #14 0x42b2bb in _Py_UnixMain Modules/main.c:940
 #15 0x4258ee in main Programs/python.c:16
 #16 0x7fb085983412 in __libc_start_main ../csu/libc-start.c:308
Direct leak of 34 byte(s) in 1 object(s) allocated from:
 #0 0x7fb085e03c08 in __interceptor_malloc (/lib64/libasan.so.5+0xefc08)
 #1 0x4d99a2 in _PyMem_RawMalloc Objects/obmalloc.c:99
 #2 0x4d9b4a in _PyMem_DebugRawAlloc Objects/obmalloc.c:2020
 #3 0x4d9ba5 in _PyMem_DebugRawMalloc Objects/obmalloc.c:2049
 #4 0x4dc354 in PyMem_RawMalloc Objects/obmalloc.c:527
 #5 0x4dc510 in _PyMem_RawStrdup Objects/obmalloc.c:613
 #6 0x652f5f in get_ctype_locale Python/preconfig.c:483
 #7 0x6560a6 in _PyPreConfig_Read Python/preconfig.c:506
 #8 0x6585f8 in pyinit_preconfig Python/pylifecycle.c:723
 #9 0x65f8b0 in _Py_InitializeCore Python/pylifecycle.c:781
 #10 0x42abba in pymain_init Modules/main.c:370
 #11 0x42addc in pymain_main Modules/main.c:889
 #12 0x42b2bb in _Py_UnixMain Modules/main.c:940
 #13 0x4258ee in main Programs/python.c:16
 #14 0x7fb085983412 in __libc_start_main ../csu/libc-start.c:308
SUMMARY: AddressSanitizer: 68 byte(s) leaked in 2 allocation(s).
generate-posix-vars failed
make: *** [Makefile:586: pybuilddir.txt] Error 1