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Usually GCC prerequisite libraries (libmpc, libmpfr and libgmp) can be installed via MinGW package manager. This time they were build from source because of MinGW repository server was down.

Important note: --build and --host options are here to prevent libraries from binding to latest CPU features like AVX2.

1. Update C:\MinGW\msys\1.0\opt\crosstool\src\build_gcc_cross.sh :

   #!/bin/bash
   export PATH=.:/usr/local/bin:/mingw/bin:/bin
   export PATH=$PATH:/c/WINDOWS/system32:/c/WINDOWS
   export PATH=$PATH:/c/WINDOWS/System32/Wbem
   
   cd /opt/crosstool/src/build-gmp
   ../gmp-5.1.2/configure \
      --build=i586-pc-mingw32 --host=i586-pc-mingw32 \
      --disable-shared --enable-static
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to configure libgmp ==="
       exit 1
   fi
   make
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to make libgmp ==="
       exit 1
   fi
   make check
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to check libgmp ==="
       exit 1
   fi
   make install
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to install libgmp ==="
       exit 1
   fi
   
   cd /opt/crosstool/src/build-mpfr
   ../mpfr-3.1.2/configure \
      --build=i586-pc-mingw32 --host=i586-pc-mingw32 \
      --with-gmp=/usr/local --disable-shared --enable-static
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to configure libmpfr ==="
       exit 1
   fi
   make
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to make libmpfr ==="
       exit 1
   fi
   make check
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to check libmpfr ==="
       exit 1
   fi
   make install
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to install libmpfr ==="
       exit 1
   fi
   
   cd /opt/crosstool/src/build-mpc
   ../mpc-1.0.2/configure \
      --build=i586-pc-mingw32 --host=i586-pc-mingw32 \
      --with-gmp=/usr/local --disable-shared --enable-static
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to configure libmpc ==="
       exit 1
   fi
   make
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to make libmpc ==="
       exit 1
   fi
   make check
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to check libmpc ==="
       exit 1
   fi
   make install
   if [ "$?" -ne "0" ]; then
       echo "=== build script: failed to install libmpc ==="
       exit 1
   fi
   
   echo "=== build script: OK ==="
   

2. Run C:\MinGW\msys\1.0\opt\crosstool\src\build_gcc_cross.cmd and wait until it completes.
3. If there are no errors, shutdown MinGW VM and make snapshot "SNAP-C".

>> Read next section or buy already prepared cross-compiler (€10) to save your time.