Perl will search these directories (including architecture and
version-specific subdirectories) for add-on modules and extensions.
+=item APPLLIB_EXP
+
+There is one other way of adding paths to @INC at perl build time, and
+that is by setting the APPLLIB_EXP C pre-processor token to a colon-
+separated list of directories, like this
+
+ sh Configure -Accflags='-DAPPLLIB_EXP=\"/usr/libperl\"'
+
+The directories defined by APPLLIB_EXP get added to @INC I<first>,
+ahead of any others, and so provide a way to override the standard perl
+modules should you, for example, want to distribute fixes without
+touching the perl distribution proper. And, like otherlib dirs,
+version and architecture specific subdirectories are also searched, if
+present, at run time. Of course, you can still search other @INC
+directories ahead of those in APPLLIB_EXP by using any of the standard
+run-time methods: $PERLLIB, $PERL5LIB, -I, use lib, etc.
+
=item Man Pages
In versions 5.005_57 and earlier, the default was to store module man
=back
+=head2 Building DB, NDBM, and ODBM interfaces with Berkeley DB 3
+
+Perl interface for DB3 is part of Berkeley DB, but if you want to
+compile standard Perl DB/ODBM/NDBM interfaces, you must follow
+following instructions.
+
+Berkeley DB3 from Sleepycat Software is by default installed without
+DB1 compatibility code (needed for DB_File interface) and without
+links to compatibility files. So if you want to use packages written
+for DB/ODBM/NDBM interfaces, you need to configure DB3 with
+--enable-compat185 (and optionally with --enable-dump185) and create
+additional references (suppose you are installing DB3 with
+--prefix=/usr):
+
+ ln -s libdb-3.so /usr/lib/libdbm.so
+ ln -s libdb-3.so /usr/lib/libndbm.so
+ echo '#define DB_DBM_HSEARCH 1' >dbm.h
+ echo '#include <db.h>' >>dbm.h
+ install -m 0644 dbm.h /usr/include/dbm.h
+ install -m 0644 dbm.h /usr/include/ndbm.h
+
+Optionally, if you have compiled with --enable-compat185 (not needed
+for ODBM/NDBM):
+
+ ln -s libdb-3.so /usr/lib/libdb1.so
+ ln -s libdb-3.so /usr/lib/libdb.so
+
+ODBM emulation seems not to be perfect, but is quite usable,
+using DB 3.1.17:
+
+ lib/odbm.............FAILED at test 9
+ Failed 1/64 tests, 98.44% okay
+
=head2 What if it doesn't work?
If you run into problems, try some of the following ideas.