On 06/13/2017 01:54 PM, H.J. Lu wrote: > - echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}" > + echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "\,$1:,{s/:\$//;p}" > } > CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)" > + # Also make a copy of from GCC 7 to prevent it from > + # including /usr/include/stdlib.h. > + CXX_CSTDLIB_HEADER="$CXX_CSTDLIB_HEADER $(find_cxx_header bits/std_abs.h)" I think the attached patch is needed to suppress the error message if the header does not exist. (Regenerated configure file not shown in the patch.) Thanks, Florian