checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking if gcc supports -O4 -Werror flags... yes
checking for sys/wait.h that is POSIX.1 compatible... yes
checking how to run the C preprocessor... gcc -E
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking signal.h usability... yes
checking signal.h presence... yes
checking for signal.h... yes
checking stddef.h usability... yes
checking stddef.h presence... yes
checking for stddef.h... yes
checking for unistd.h... (cached) yes
checking for sys/types.h... (cached) yes
checking for sys/wait.h... (cached) yes
checking for stdlib.h... (cached) yes
checking for string.h... (cached) yes
checking errno.h usability... yes
checking errno.h presence... yes
checking for errno.h... yes
checking limits.h usability... yes
checking limits.h presence... yes
checking for limits.h... yes
checking for stdint.h... (cached) yes
checking pthread.h usability... yes
checking pthread.h presence... yes
checking for pthread.h... yes
checking for pid_t... yes
checking whether ftell is declared... yes
checking whether popen is declared... yes
checking whether fdopen is declared... yes
checking whether putenv is declared... yes
checking whether setenv is declared... yes
checking whether malloc is declared... yes
checking if INFINITY is declared in math.h... 1
checking size of int... 4
checking size of long... 8
checking size of long long... 8
checking size of void*... 8
checking size of __int128... 16
checking size of __int128_t... 16
checking for isatty... yes
checking for time... yes
checking for gettimeofday... yes
checking for times... yes
checking for getrusage... yes
checking for perror... yes
checking for pipe... yes
checking for wait... yes
checking for popen... yes
checking for putenv... yes
checking for setenv... yes
checking vfork.h usability... no
checking vfork.h presence... no
checking for vfork.h... no
checking for fork... yes
checking for vfork... yes
checking for working fork... yes
checking for working vfork... (cached) yes
checking for fseeko... yes
checking for sigaction... yes
checking for sigprocmask... yes
checking if popcnt instruction is available and requested... 1
checking if __builtin_popcount() is supported... 1
checking if __builtin_popcountl() is supported... 1
checking if __builtin_popcountll() is supported... 1
checking if gcc supports -march=native... yes
CC=gcc
CFLAGS= -O4
MORECFLAGS= -mpopcnt -march=native
checking if lzcnt instruction is available and requested... 0
checking if __builtin_clz() is supported... 1
checking if __builtin_clzl() is supported... 1
checking if __builtin_clzll() is supported... 1
checking for pthread_create... no
checking for getc_unlocked... yes
checking for flockfile... yes
checking for gsort... no
checking for sort... sort
checking if sort supports the -k switch... 1
configure: creating ./config.status
config.status: creating makefile
config.status: creating nauty.h
config.status: creating naututil.h
config.status: creating gtools.h