+
+# unistd.h contains incorrect prototypes for some functions in the usual
+# BSD-ish environment. In particular, it has
+# extern int getgroups(/* int gidsetsize, gid_t grouplist[] */);
+# but groupslist[] ought to be of type int, not gid_t.
+# This is only really a problem for perl if the
+# user is using gcc, and not running in the SysV environment.
+# The gcc fix-includes script exposes those incorrect prototypes.
+# There may be other examples as well. Volunteers are welcome to
+# track them all down :-). In the meantime, we'll just skip unistd.h
+# for SunOS in most of the code.
+# However, see ext/POSIX/hints/sunos_4.pl for one exception.
+i_unistd='undef'
+# See util.c for another: We need _SC_OPEN_MAX, which is in
+# <unistd.h>.
+
+# fflush(NULL) will core dump on SunOS 4.1.3. In util.c we'll
+# try explicitly fflushing all open files. Unfortunately,
+# on my SunOS 4.1.3 system, sysconf(_SC_OPEN_MAX) returns
+# 64, but only 32 of those file pointers can be accessed
+# directly by _iob[i]. The remainder are off in dynamically
+# allocated memory somewhere and I don't know to automatically
+# fflush() them. -- Andy Dougherty Wed May 26 15:25:22 EDT 1999
+util_cflags='ccflags="$ccflags -DPERL_FFLUSH_ALL_FOPEN_MAX=32"'
+
+# The correct setting of groupstype depends on which version of the C
+# library is used. If you are in the 'System V environment'
+# (i.e. you have /usr/5bin ahead of /usr/bin in your PATH), and
+# you use Sun's cc compiler, then you'll pick up /usr/5bin/cc, which
+# links against the C library in /usr/5lib. This library has
+# groupstype='gid_t'.
+# If you are in the normal BSDish environment, then you'll pick up
+# /usr/ucb/cc, which links against the C library in /usr/lib. That
+# library has groupstype='int'.
+#
+# If you are using gcc, it links against the C library in /usr/lib
+# independent of whether or not you are in the 'System V environment'.
+# If you want to use the System V libraries, then you need to
+# manually set groupstype='gid_t' and add explicit references to
+# /usr/5lib when Configure prompts you for where to look for libraries.
+#
+# Check if user is in a bsd or system 5 type environment