INSTALL.txt

Clone the library:

$ git clone https://github.com/fdch/fd_lib.git

You will be able to load abstractions, but to use the external objects you'll need to compile them:

$ bash config.sh [/path/to/pd-lib-builder] (*)
$ make
$ make install

The last step will allow Pure Data to load the library with the Help Browser.
You can pass your default paths, for example:

 PDLIBDIR=path/to/Pd/externals

In Pure Data, you probably need to declare the library with [declare -lib fd_lib -path fd_lib]

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Windows
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Check Pd's INSTALL.txt file for more information, because the build environment is the same.
Use the Mintty terminal (MYSYS2) and run a "Mingw-w64 64 bit" Shell (bash) emulator.

Before running make, you must indicate the path to Pure Data's "bin" and "src" directories:

 pdbinpath=/c/Users/.../pd-0.50-0/bin PDINCLUDEDIR=/c/Users/.../src

You might also need to determine which architecture, for example:

 CFLAGS= -march=x86-64 -Iinclude

The complete make command in Windows might looks like this:

$ make pdbinpath=/c/Users/.../pd-0.50-0/bin PDINCLUDEDIR=/c/Users/.../src CFLAGS=-march=x86-64 -Iinclude

I recommend the usual library installation in %AppData%, which is the default.
If you locate the library someplace else, please also place a [declare -path /path/to/fd_lib]
in your patches or just ADD the PATH to "fd_lib" in File > Preferences > Path

(*) fd_lib is shipped with pd-lib-builder, so you can clone it with --recurse-submodules or
do "git submodule init" and "git submodule update". If you do this, you dont need to pass the
pd-lib-builder path to the config.sh command.