cf_xopen_source="-D_SGI_SOURCE"
cf_XOPEN_SOURCE=
;;
-(linux*gnu|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin)
+(linux*gnu|linux*gnuabi64|linux*gnuabin32|linux*gnueabi|linux*gnueabihf|linux*gnux32|uclinux*|gnu*|mint*|k*bsd*-gnu|cygwin)
cf_gnu_xopen_source=$cf_XOPEN_SOURCE