Checking if your kit is complete...
Looks good
Writing Makefile for Math::Symbolic::Custom::ErrorPropagation
cp lib/Math/Symbolic/Custom/ErrorPropagation.pm blib/lib/Math/Symbolic/Custom/ErrorPropagation.pm
Manifying blib/man3/Math::Symbolic::Custom::ErrorPropagation.3
PERL_DL_NONLAZY=1 /Users/cpanrun/build/5.10.0/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(1, 'blib/lib', 'blib/arch')" t/*.t
t/00basic....1..5
ok 1 - use Math::Symbolic;
ok 2 - use Math::Symbolic::Custom::ErrorPropagation;
ok 3 - No dependencies -> 0
ok 4 - variance in case of one dependency
ok 5 - variance in case of two dependencies
ok
All tests successful.
Files=1, Tests=5,  1 wallclock secs ( 0.72 cusr +  0.08 csys =  0.80 CPU)
Installing /Users/cpanrun/build/5.10.0/html/site/lib/Math/Symbolic/Custom/ErrorPropagation.html
Installing /Users/cpanrun/build/5.10.0/site/lib/Math/Symbolic/Custom/ErrorPropagation.pm
Installing /Users/cpanrun/build/5.10.0/site/man/man3/Math::Symbolic::Custom::ErrorPropagation.3
Appending installation info to /Users/cpanrun/build/5.10.0/lib/perllocal.pod
make: *** [doc_update] Hangup