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WRF compile error ***[lex.yy.c]

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compile kpp
make[1]: Entering directory `/home/sahir/WRF371/Build_WRF/WRFV3/chem/KPP/kpp/kpp-2.1/src'
/home/sahir/WRF371/Build_WRF/LIBRARIES/byacc/bin/yacc -d scan.y
gcc -O -c
/home/sahir/WRF371/Build_WRF/LIBRARIES/flex scan.l
make[1]: execvp: /home/sahir/WRF371/Build_WRF/LIBRARIES/flex: Permission denied
make[1]: *** [lex.yy.c] Error 127
make[1]: Leaving directory `/home/sahir/WRF371/Build_WRF/WRFV3/chem/KPP/kpp/kpp-2.1/src'