Summary of my perl5 (revision 5 version 25 subversion 10) configuration: Commit id: 7f8a472bea19cb7746a1be14c8fe5cfde32c6363 Platform: osname=linux osvers=4.4.0-62-generic archname=x86_64-linux uname='linux zareason 4.4.0-62-generic #83-ubuntu smp wed jan 18 14:10:15 utc 2017 x86_64 x86_64 x86_64 gnulinux ' config_args='-des -Dusedevel -Uversiononly -Dprefix=/home/jkeenan/testing/blead -Dman1dir=none -Dman3dir=none -DDEBUGGING' hint=recommended useposix=true d_sigaction=define useithreads=undef usemultiplicity=undef use64bitint=define use64bitall=define uselongdouble=undef usemymalloc=n bincompat5005=undef Compiler: cc='cc' ccflags ='-fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64' optimize='-O2 -g' cppflags='-fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include' ccversion='' gccversion='5.4.0 20160609' gccosandvers='' intsize=4 longsize=8 ptrsize=8 doublesize=8 byteorder=12345678 doublekind=3 d_longlong=define longlongsize=8 d_longdbl=define longdblsize=16 longdblkind=3 ivtype='long' ivsize=8 nvtype='double' nvsize=8 Off_t='off_t' lseeksize=8 alignbytes=8 prototype=define Linker and Libraries: ld='cc' ldflags =' -fstack-protector-strong -L/usr/local/lib' libpth=/usr/local/lib /usr/lib/gcc/x86_64-linux-gnu/5/include-fixed /usr/include/x86_64-linux-gnu /usr/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib /lib64 /usr/lib64 libs=-lpthread -lnsl -ldb -ldl -lm -lcrypt -lutil -lc perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc libc=libc-2.23.so so=so useshrplib=false libperl=libperl.a gnulibc_version='2.23' Dynamic Linking: dlsrc=dl_dlopen.xs dlext=so d_dlsymun=undef ccdlflags='-Wl,-E' cccdlflags='-fPIC' lddlflags='-shared -O2 -g -L/usr/local/lib -fstack-protector-strong' Characteristics of this binary (from libperl): Compile-time options: DEBUGGING HAS_TIMES PERLIO_LAYERS PERL_COPY_ON_WRITE PERL_DONT_CREATE_GVSV PERL_MALLOC_WRAP PERL_OP_PARENT PERL_PRESERVE_IVUV PERL_USE_DEVEL USE_64_BIT_ALL USE_64_BIT_INT USE_LARGE_FILES USE_LOCALE USE_LOCALE_COLLATE USE_LOCALE_CTYPE USE_LOCALE_NUMERIC USE_LOCALE_TIME USE_PERLIO USE_PERL_ATOF Built under linux Compiled at Feb 9 2017 14:58:59 %ENV: PERLBREW_BASHRC_VERSION="0.67" PERLBREW_HOME="/home/jkeenan/.perlbrew" PERLBREW_MANPATH="/home/jkeenan/perl5/perlbrew/perls/perl-5.24.1/man" PERLBREW_PATH="/home/jkeenan/perl5/perlbrew/bin:/home/jkeenan/perl5/perlbrew/perls/perl-5.24.1/bin" PERLBREW_PERL="perl-5.24.1" PERLBREW_ROOT="/home/jkeenan/perl5/perlbrew" PERLBREW_VERSION="0.67" PERL_WORKDIR="/home/jkeenan/gitwork/perl" @INC: lib /home/jkeenan/testing/blead/lib/perl5/site_perl/5.25.10/x86_64-linux /home/jkeenan/testing/blead/lib/perl5/site_perl/5.25.10 /home/jkeenan/testing/blead/lib/perl5/5.25.10/x86_64-linux /home/jkeenan/testing/blead/lib/perl5/5.25.10 .