in reply to What defines "Pure Perl"?
L - Language Used
p  -  Perl-only, no compiler needed, should be platform independent
c  -  C and perl, a C compiler will be needed
h  -  Hybrid, written in perl with optional C code, no compiler needed
+  -  C++ and perl, a C++ compiler will be needed
o  -  perl and another language other than C or C++