Hello Team,  While installing Python-3.5.9 in CentOS-5 I am getting the below errors: ======>> [root@manage Python-3.5.9]# grep error config.logconftest.c:11:28: error: ac_nonexistent.h: No such file or directoryconftest.c:11:28: error: ac_nonexistent.h: No such file or directoryconftest.c:54:26: error: minix/config.h: No such file or directoryconftest.c:21:26: error: minix/config.h: No such file or directoryconfigure:6961: gcc -fstrict-aliasing -c  -Werror -Wstrict-aliasing  conftest.c >&5cc1: warnings being treated as errorsconfigure:7017: gcc -Wunused-result -Werror -c   conftest.c >&5cc1: error: unrecognized command line option "-Wunused-result"configure:7041: checking for -Werror=declaration-after-statementconfigure:7062: gcc -Werror=declaration-after-statement -c   conftest.c >&5cc1: error: unrecognized command line option "-Werror=declaration-after-statement"conftest.c:62:19: error: conio.h: No such file or directoryconftest.c:29:19: error: conio.h: No such file or directoryconftest.c:62:20: error: direct.h: No such file or directoryconftest.c:29:20: error: direct.h: No such file or directoryconftest.c:66:20: error: ieeefp.h: No such file or directoryconftest.c:33:20: error: ieeefp.h: No such file or directoryconftest.c:66:16: error: io.h: No such file or directoryconftest.c:33:16: error: io.h: No such file or directoryconftest.c:68:21: error: process.h: No such file or directoryconftest.c:35:21: error: process.h: No such file or directoryconftest.c:78:25: error: sys/devpoll.h: No such file or directoryconftest.c:45:25: error: sys/devpoll.h: No such file or directoryconftest.c:80:25: error: sys/audioio.h: No such file or directoryconftest.c:47:25: error: sys/audioio.h: No such file or directoryconftest.c:81:24: error: sys/bsdtty.h: No such file or directoryconftest.c:48:24: error: sys/bsdtty.h: No such file or directoryconftest.c:81:23: error: sys/event.h: No such file or directoryconftest.c:48:23: error: sys/event.h: No such file or directoryconftest.c:83:30: error: sys/kern_control.h: No such file or directoryconftest.c:50:30: error: sys/kern_control.h: No such file or directoryconftest.c:83:25: error: sys/loadavg.h: No such file or directoryconftest.c:50:25: error: sys/loadavg.h: No such file or directoryconftest.c:83:22: error: sys/lock.h: No such file or directoryconftest.c:50:22: error: sys/lock.h: No such file or directoryconftest.c:83:23: error: sys/mkdev.h: No such file or directoryconftest.c:50:23: error: sys/mkdev.h: No such file or directoryconftest.c:83:23: error: sys/modem.h: No such file or directoryconftest.c:50:23: error: sys/modem.h: No such file or directoryconftest.c:84:24: error: sys/random.h: No such file or directoryconftest.c:51:24: error: sys/random.h: No such file or directoryconftest.c:90:28: error: sys/sys_domain.h: No such file or directoryconftest.c:57:28: error: sys/sys_domain.h: No such file or directoryconftest.c:90:24: error: sys/termio.h: No such file or directoryconftest.c:57:24: error: sys/termio.h: No such file or directoryconftest.c:98:21: error: libutil.h: No such file or directoryconftest.c:65:21: error: libutil.h: No such file or directoryconftest.c:101:23: error: bluetooth.h: No such file or directoryconftest.c:68:23: error: bluetooth.h: No such file or directoryconftest.c:101:33: error: bluetooth/bluetooth.h: No such file or directoryconftest.c:68:33: error: bluetooth/bluetooth.h: No such file or directory/usr/include/linux/random.h:38: error: expected specifier-qualifier-list before '__u32'/usr/include/linux/random.h:42: error: expected specifier-qualifier-list before '__u32'conftest.c:103:18: error: util.h: No such file or directoryconftest.c:70:18: error: util.h: No such file or directoryconftest.c:105:24: error: sys/endian.h: No such file or directoryconftest.c:72:24: error: sys/endian.h: No such file or directoryconftest.c:81:23: error: linux/can.h: No such file or directoryconftest.c:81:27: error: linux/can/raw.h: No such file or directoryconftest.c:81:27: error: linux/can/bcm.h: No such file or directoryconftest.c:117: error: expected expression before ')' tokenconftest.c:117: error: expected expression before ')' tokenconftest.c:117: error: expected expression before ')' tokenconftest.c:118: error: expected expression before ')' tokenconftest.c:118: error: expected expression before ')' tokenconftest.c:119: error: expected expression before ')' tokenconftest.c:120: error: expected expression before ')' tokenconftest.c:123: error: size of array 'test_array' is negativeconftest.c:121: error: expected expression before ')' tokenconftest.c:124: error: size of array 'test_array' is negativeconftest.c:122: error: expected expression before ')' tokenconftest.c:123: error: '__uint128_t' undeclared (first use in this function)conftest.c:123: error: (Each undeclared identifier is reported only onceconftest.c:123: error: for each function it appears in.)conftest.c:112: error: expected expression before ')' token| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:115:27: error: linux/can/raw.h: No such file or directoryconftest.c:119: error: 'CAN_RAW_FD_FRAMES' undeclared (first use in this function)conftest.c:119: error: (Each undeclared identifier is reported only onceconftest.c:119: error: for each function it appears in.)conftest.c:115:29: error: Carbon/Carbon.h: No such file or directoryconftest.c:119: error: 'FSIORefNum' undeclared (first use in this function)conftest.c:119: error: (Each undeclared identifier is reported only onceconftest.c:119: error: for each function it appears in.)conftest.c:119: error: expected ';' before 'fRef'| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.configure:11281: checking for gai_strerror| /* Override any GCC internal prototype to avoid an error.conftest.c:189: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'me'| /* Override any GCC internal prototype to avoid an error.conftest.c:193: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'me'| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:264: error: 'epoll_create1' undeclared (first use in this function)conftest.c:264: error: (Each undeclared identifier is reported only onceconftest.c:264: error: for each function it appears in.)conftest.c:262:23: error: sys/event.h: No such file or directoryconftest.c:267: error: 'prlimit' undeclared (first use in this function)conftest.c:267: error: (Each undeclared identifier is reported only onceconftest.c:267: error: for each function it appears in.)conftest.c:266: error: 'ctermid_r' undeclared (first use in this function)conftest.c:266: error: (Each undeclared identifier is reported only onceconftest.c:266: error: for each function it appears in.)| /* Override any GCC internal prototype to avoid an error.configure:12030: checking for hstrerror| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:280: error: too many arguments to function 'getpgrp'conftest.c:281: error: too many arguments to function 'setpgrp'| /* Override any GCC internal prototype to avoid an error.conftest.c:326: error: 'struct stat' has no member named 'st_flags'conftest.c:326: error: 'struct stat' has no member named 'st_flags'conftest.c:326: error: 'struct stat' has no member named 'st_gen'conftest.c:326: error: 'struct stat' has no member named 'st_gen'conftest.c:326: error: 'struct stat' has no member named 'st_birthtime'conftest.c:326: error: 'struct stat' has no member named 'st_birthtime'conftest.c:294: error: 'altzone' undeclared (first use in this function)conftest.c:294: error: (Each undeclared identifier is reported only onceconftest.c:294: error: for each function it appears in.)conftest.c:302: error: 'struct sockaddr' has no member named 'sa_len'conftest.c:324:17: error: tcl.h: No such file or directoryconftest.c:326:3: error: #error "NOT UCS4_TCL"| # error "NOT UCS4_TCL"conftest.c:324: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'a'conftest.c:330: error: 'not' undeclared (first use in this function)conftest.c:330: error: (Each undeclared identifier is reported only onceconftest.c:330: error: for each function it appears in.)conftest.c:330: error: expected ';' before 'big'| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:324:31: error: readline/readline.h: No such file or directory| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:324:31: error: readline/readline.h: No such file or directory| /* Override any GCC internal prototype to avoid an error.conftest.c:334: error: 'struct stat' has no member named 'st_mtimespec'conftest.c:351: error: expected expression before ')' tokenconftest.c:342:27: error: stdatomic.h: No such file or directoryconftest.c:343: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'value'conftest.c:344: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'void'conftest.c:346: error: 'value' undeclared (first use in this function)conftest.c:346: error: (Each undeclared identifier is reported only onceconftest.c:346: error: for each function it appears in.)conftest.c:344: error: '__ATOMIC_SEQ_CST' undeclared (first use in this function)conftest.c:344: error: (Each undeclared identifier is reported only onceconftest.c:344: error: for each function it appears in.)/usr/include/linux/random.h:38: error: expected specifier-qualifier-list before '__u32'/usr/include/linux/random.h:42: error: expected specifier-qualifier-list before '__u32'conftest.c:350: error: 'GRND_NONBLOCK' undeclared (first use in this function)conftest.c:350: error: (Each undeclared identifier is reported only onceconftest.c:350: error: for each function it appears in.)conftest.c:352: error: 'SYS_getrandom' undeclared (first use in this function)conftest.c:343:28: error: sys/random.h: No such file or directoryconftest.c:347: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'buflen'conftest.c:347: error: 'buflen' undeclared (first use in this function)conftest.c:347: error: (Each undeclared identifier is reported only onceconftest.c:347: error: for each function it appears in.)ac_cv_func_gai_strerror=yes ======>> Could you please look into this asap :)    Thanking you, Saikat Das | Mobile: +91 (996) 623-9368 | Skype: das.saikat  Hyderabad, India