curl -# https://ftp.gnu.org/gnu/gmp/gmp-6.2.1.tar.xz -o gmp-6.2.1.tar.xz
tar -xf gmp-6.2.1.tar.xz gmp
curl -# wget https://ftp.gnu.org/gnu/mpfr/mpfr-4.1.0.tar.xz -o mpfr-4.1.0.tar.xz
tar -xf mprf-4.1.0.tar.xz mpfr
curl -# https://ftp.gnu.org/gnu/mpc/mpc-1.2.1.tar.gz -o mpc-1.2.1.tar.gz
tar -xf mpc-1.2.1.tar.gz mpc

# Use lib not lib64 by default.
sed '/m64=/s/lib64/lib/' gcc/gcc/config/i386/t-linux64 > _
mv -f _ gcc/gcc/config/i386/t-linux64
sed 's/lib64/lib/' gcc/gcc/config/i386/linux64.h > _
mv -f _ gcc/gcc/config/i386/linux64.h

mkdir build
cd build

../configure \
    --prefix=/usr \
    --libexecdir=/usr/lib \
    --mandir=/usr/share/man \
    --infodir=/usr/share/info \
    --disable-multilib \
    --disable-symvers \
    --disable-libmpx \
    --disable-libmudflap \
    --disable-libsanitizer \
    --disable-werror \
    --disable-fixed-point \
    --disable-libstdcxx-pch \
    --disable-nls \
    --enable-checking=release \
    --enable-__cxa_atexit \
    --enable-default-pie \
    --enable-default-ssp \
    --enable-shared \
    --enable-threads \
    --enable-tls \
    --enable-languages=c,c++

make
make DESTDIR="$1" install

# Save 35MB. (from KISS)
find "$1" -name libgtkpeer.a  -exec rm -f {} +
find "$1" -name libgjsmalsa.a -exec rm -f {} +
find "$1" -name libgij.a      -exec rm -f {} +

ln -sf gcc "$1/usr/bin/cc"

echo "#!/bin/sh" > "$1"/usr/bin/c99
echo "exec cc -std=c99 "$@"" >> "$1"/usr/bin/c99
chmod +x "$1"/usr/bin/c99