try to fix build failures
    
    Can't locate Carp.pm in @INC (@INC contains: /usr/share/autoconf
    		/usr/local/lib/perl5 /usr/local/share/perl5
    		/usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl
    		/usr/lib/perl5 /usr/share/perl5 .) at
    /usr/share/autoconf/Autom4te/Channels.pm line 72.
    BEGIN failed--compilation aborted at
    /usr/share/autoconf/Autom4te/Channels.pm line 72.
    Compilation failed in require at
    /usr/share/autoconf/Autom4te/ChannelDefs.pm line 19.
    BEGIN failed--compilation aborted at
    /usr/share/autoconf/Autom4te/ChannelDefs.pm line 19.
    Compilation failed in require at /usr/bin/autoheader line 41.
    BEGIN failed--compilation aborted at /usr/bin/autoheader line 41.
    Can't locate Carp.pm in @INC (@INC contains: /usr/share/automake-1.13
    		/usr/local/lib/perl5 /usr/local/share/perl5
    		/usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl
    		/usr/lib/perl5 /usr/share/perl5 .) at
    /usr/share/perl5/Class/Struct.pm line 11.
    BEGIN failed--compilation aborted at /usr/share/perl5/Class/Struct.pm
    line 11.
    Compilation failed in require at /usr/bin/automake line 46.
    BEGIN failed--compilation aborted at /usr/bin/automake line 46.
    Can't locate Carp.pm in @INC (@INC contains: /usr/share/autoconf
    		/usr/local/lib/perl5 /usr/local/share/perl5
    		/usr/lib/perl5/vendor_perl /usr/share/perl5/vendor_perl
    		/usr/lib/perl5 /usr/share/perl5 .) at
    /usr/lib/perl5/vendor_perl/Data/Dumper.pm line 22.
    BEGIN failed--compilation aborted at
    /usr/lib/perl5/vendor_perl/Data/Dumper.pm line 22.
    Compilation failed in require at /usr/share/autoconf/Autom4te/C4che.pm
    line 33.
    BEGIN failed--compilation aborted at
    /usr/share/autoconf/Autom4te/C4che.pm line 33.
    Compilation failed in require at /usr/bin/autom4te line 37.
    BEGIN failed--compilation aborted at /usr/bin/autom4te line 37.