fi
if test -z "$CC"; then
AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
AC_CHECK_PROG(CC, cc, cc, clang, , , /usr/ucb/cc)
AC_CHECK_TOOLS(CC, cl.exe)
else
AC_CHECK_TOOLS(CXX,
[m4_default([$1],
[g++ c++ gpp aCC CC cxx cc++ cl.exe FCC KCC RCC xlC_r xlC])],
[g++ c++ clang++ gpp aCC CC cxx cc++ cl.exe FCC KCC RCC xlC_r xlC])],
g++)