This variable holds a list of XS extension files we want to
link dynamically into the package. It is used by Makefile.
+dtrace (dtrace.U):
+ This variable holds the location of the dtrace executable.
+
eagain (nblock_io.U):
This variable bears the symbolic errno code set by read() when no
data is present on the file and non-blocking I/O was enabled (otherwise,
This variable indicates if the system supports dynamic
loading of some sort. See also dlsrc and dlobj.
+usedtrace (trace.U):
+ This variable indicates whether we are compiling with dtrace support.
+ See also dtrace.
+
usefaststdio (usefaststdio.U):
This variable conditionally defines the USE_FAST_STDIO symbol,
and indicates that Perl should be built to use 'fast stdio'.