Dear all, I built gcc-8.3.0 into a separate directory from the sources but still failed. My commands are as follows: 1 cd .. 2 mkdir gcc1 3 cd gcc1 4 ../gcc-8.3.0/configure --prefix=/public/home/lengjun/softwares/gcc1 --with-gmp=/public/home/lengjun/softwares_install_leng/gmp-6.1.0 --with-mpfr=/public/home/lengjun/softwares_install_leng/mpfr-3.1.4 --with-mpc=/public/home/lengjun/softwares_install_leng/mpc-1.0.3 --with-isl=/public/home/lengjun/softwares_install_leng/isl-0.18 --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux --disable-multilib 5 make The error is: configure: error: source directory already configured; run "make distclean" there first Then I ran make distclean in the path gcc1 and it showed that: ... make: [local-distclean] Error 1 (ignored) rmdir texinfo/makeinfo texinfo/po texinfo/util 2>/dev/null make: [local-distclean] Error 1 (ignored) rmdir fastjar gcc gnattools gotools libcc1 libiberty 2>/dev/null make: [local-distclean] Error 1 (ignored) rmdir texinfo zlib 2>/dev/null make: [local-distclean] Error 1 (ignored) find . -name config.cache -exec rm -f {} \; \; 2>/dev/null make: [local-distclean] Error 1 (ignored) Then I create another new directory and it still showed the error above. Can anybody help me? Best regards, Jun Attached is relevant information.