Checking if your kit is complete...
Looks good
Writing Makefile for String::DiffLine
cp DiffLine.pm blib/lib/String/DiffLine.pm
AutoSplitting blib/lib/String/DiffLine.pm (blib/lib/auto/String/DiffLine)
/home/cpanrun/tmp/5.10.0/bin/perl /home/cpanrun/build/5.10.0/lib/ExtUtils/xsubpp  -typemap /home/cpanrun/build/5.10.0/lib/ExtUtils/typemap  DiffLine.xs > DiffLine.xsc && mv DiffLine.xsc DiffLine.c
gcc -c   -D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -DPRIVLIB_LAST_IN_INC -fno-strict-aliasing -pipe -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm -O2   -DVERSION=\"0.02\" -DXS_VERSION=\"0.02\" -fPIC "-I/home/cpanrun/build/5.10.0/lib/CORE"   DiffLine.c
DiffLine.xs: In function `XS_String__DiffLine_diffline':
DiffLine.xs:49: `sv_undef' undeclared (first use in this function)
DiffLine.xs:49: (Each undeclared identifier is reported only once
DiffLine.xs:49: for each function it appears in.)
make: *** [DiffLine.o] Error 1
PERL_DL_NONLAZY=1 /home/cpanrun/tmp/5.10.0/bin/perl "-Iblib/lib" "-Iblib/arch" test.pl
1..12
ok 1
$/=\n in=abcdef,abcxyz out=3,1,3 expected=3,1,3
ok 2
$/=\n in=abcdef,abc out=3,1,3 expected=3,1,3
ok 3
$/=\n in=abc,abc out=,1,3 expected=,1,3
ok 4
$/=\n in=abc\ndefg,abc\ndxy out=5,2,1 expected=5,2,1
ok 5
$/=\n in=abc\n\ndefg,abc\n\ndxy out=6,3,1 expected=6,3,1
ok 6
$/=\n in=abc\ndef\n,abc\ndef\n out=,3,0 expected=,3,0
ok 7
$/=x in=abcxdefg,abcxdefy out=7,2,3 expected=7,2,3
ok 8
$/= in=abc\n\n\ndefg,abc\n\n\nxy out=6,2,0 expected=6,2,0
ok 9
$/=121 in=1212121def,1212121dex out=9,3,2 expected=9,3,2
ok 10
$/=112 in=11121112de,11121112df out=9,3,1 expected=9,3,1
ok 11
$/=112 in=112112x,112112ab out=6,3,0 expected=6,3,0
ok 12
Files found in blib/arch: installing files in blib/lib into architecture dependent library tree
Installing /home/cpanrun/build/5.10.0/site/lib/auto/String/DiffLine/DiffLine.so
Installing /home/cpanrun/build/5.10.0/site/lib/auto/String/DiffLine/DiffLine.bs
Installing /home/cpanrun/build/5.10.0/html/site/lib/String/DiffLine.html
Installing /home/cpanrun/build/5.10.0/site/lib/auto/String/DiffLine/autosplit.ix
Installing /home/cpanrun/build/5.10.0/site/lib/String/DiffLine.pm
Installing /home/cpanrun/build/5.10.0/site/man/man3/String::DiffLine.3
Appending installation info to /home/cpanrun/build/5.10.0/lib/perllocal.pod