These commands are basically a pkg-config equivalent for perl. If you just type these commands by themselves in a terminal, you should get the appropriate compiler and linker options for embedding perl in that environment.
perl -MExtUtils::Embed -e ccopts
perl -MExtUtils::Embed -e ldopts
So what PERL_FLAGS=$(shell perl -MExtUtils::Embed -e ccopts) is actually doing is setting the PERL_FLAGS variable to the output of the command 'perl -MExtUtils::Embed -e ccopts'.
On my system (10.04 x64) the output of those commands is as follows:
-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/lib/perl/5.10/CORE
And
-Wl,-E -fstack-protector -L/usr/local/lib -L/usr/lib/perl/5.10/CORE -lperl -ldl -lm -lpthread -lc -lcrypt
Additionally, the perl vars should be getting passed to the final COPTS and LINKOPTS vars.
COPTS=$(WFLAGS) ... $(DFLAGS) $(MYSQL_FLAGS) $(PERL_FLAGS)
LINKOPTS=$(COPTS) ... $(MYSQL_LIB) $(PERL_LIB)
I'm in 10.04 x64 but I wouldn't think that the environment would be so drastically different in 10.10.
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