Dear All, I tried to compile the MPICH 3.0.4 with Intel C/C++/Fortran compiler 13.1.1 on scientific linux 6.4 x64 platform. The building steps were as follows: export CC=icc CXX=icpc CPP='icc -E' CXXCPP='icpc -E' F77=ifort FC=ifort CFLAGS='-O3 -xHost -ip -no-prec-div -static-intel' CXXFLAGS='-O3 -xHost -ip -no-prec-div -static-intel' FFLAGS='-O3 -xHost -ip -no-prec-div -static-intel' configure --prefix=/home/sl/mpich-3.0.4 --disable-fast 2>&1 | tee c.log make 2>&1 | tee m.log make install 2>&1 | tee mi.log The terminal reported many warning of pragma during 'make', such like the following: ../src/binding/f77/fdebug.c(22): warning #20: identifier "MPIR_IS_BOTTOM" is undefined #pragma weak MPIR_IS_BOTTOM = mpir_is_bottom_ ^ The log files were attached. How can I resolve this issue? Thanks in advance. <[email protected]>