pandas/_libs/src/klib/khash_python.h:28: internal compiler error: in gen_lowpart_general, at rtlhooks.c:59
install 0.23.4 pandas using pip get error:
```
    pandas/_libs/hashtable.c: In function ‘__pyx_f_6pandas_5_libs_9hashtable_15StringHashTable_get_item’:
    pandas/_libs/hashtable.c:20467: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c: In function ‘__pyx_f_6pandas_5_libs_9hashtable_15StringHashTable_set_item’:
    pandas/_libs/hashtable.c:20696: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c: In function ‘__pyx_pf_6pandas_5_libs_9hashtable_15StringHashTable_10get_indexer’:
    pandas/_libs/hashtable.c:21062: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c: In function ‘__pyx_pf_6pandas_5_libs_9hashtable_15StringHashTable_12unique’:
    pandas/_libs/hashtable.c:21397: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c: In function ‘__pyx_pf_6pandas_5_libs_9hashtable_15StringHashTable_16lookup’:
    pandas/_libs/hashtable.c:22033: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c:22056: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c: In function ‘__pyx_pf_6pandas_5_libs_9hashtable_15StringHashTable_18map_locations’:
    pandas/_libs/hashtable.c:22428: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c:22451: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c: In function ‘__pyx_pf_6pandas_5_libs_9hashtable_15StringHashTable_20get_labels’:
    pandas/_libs/hashtable.c:22968: warning: assignment discards qualifiers from pointer target type
    pandas/_libs/hashtable.c: At top level:
    pandas/_libs/hashtable.c:59747: warning: ‘optimize’ attribute directive ignored
    pandas/_libs/src/klib/khash_python.h: In function ‘kh_put_float64’:
    pandas/_libs/src/klib/khash_python.h:28: internal compiler error: in gen_lowpart_general, at rtlhooks.c:59
    Please submit a full bug report,
    with preprocessed source if appropriate.
    See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.
    Preprocessed source stored into /tmp/cc3c6V5f.out file, please attach this to your bugreport.
    error: command 'gcc' failed with exit status 1
```
env:
python: 2.7.15
gcc: 4.1.2
install in virtualenv