#! /bin/sh CC=cc export CC cat > x.c << EOF /* * exit 0 if we have the getgroups system or library call. */ main() { int g[100], ng; ng = getgroups(100, g); if (ng) exit(0); exit(1); } EOF if ${CC} x.c > /dev/null 2>&1 && ./a.out ; then echo '#define HAVE_GETGROUPS' fi rm -f x.c x.o a.out cat > x.c << EOF extern int dup2(); main() { exit(dup2(1, 2) == -1); } EOF if ${CC} x.c > /dev/null 2>&1 && ./a.out ; then echo '#define HAVE_DUP2' fi rm -f a.out x.c x.o cat > x.c << EOF extern int getpageesize(); main() { int n = getpagesize(); } EOF if ${CC} x.c > /dev/null 2>&1 then echo '#define HAVE_GETPAGESIZE' fi rm -f a.out x.c x.o cat > x.c << EOF extern int getdtablesize(); main() { int n = getdtablesize(); } EOF if ${CC} x.c > /dev/null 2>&1 then echo '#define HAVE_GETDTABLESIZE' fi rm -f a.out x.c x.o cat > x.c << EOF extern int setdtablesize(); main() { int n = setdtablesize(128); } EOF if ${CC} x.c > /dev/null 2>&1 then echo '#define HAVE_SETDTABLESIZE' fi rm -f a.out x.c x.o exit 0