building

$ make
$ simh-pdp11 boot.ini

the installation process is as follows:

• build the bootloader, kernel, userspace, and tools.
• use tools/mkfs to copy the root directory to boot.img
• use tools/mkboot to install the bootloader to the first sector of boot.img

building pdp11-aout-gcc

binutils

download the latest version of binutils

tar xvf /path/to/binutils-version-stuff.tar.bz2
cd binutils-version-stuff
mkdir build-pdp11-aout
cd build-pdp11-aout
../configure --target=pdp11-aout --prefix=$PREFIX
make
sudo make install

gcc

download gcc 9 or greater gcc. if gcc 9 has not been released yet, get a development snapshot.

tar xvf /path/to/gcc-version-stuff.tar.bz2
cd gcc-version-stuff
mkdir build-pdp11-aout
cd build-pdp11-aout
../configure --target=pdp11-aout --prefix=$PREFIX --enable-languages=c --disable-libssp
make
sudo make install

build references:

• http://docs.cslabs.clarkson.edu/wiki/Developing_for_a_PDP-11
• https://wiki.osdev.org/GCC_Cross-Compiler