Added manual install instructions

README.md

@@ -12,14 +12,15 @@ to reproduce that format exactly.
 
 ## Supported Environment
 
-The automated installation currently supports 64-bit Debian and Ubuntu systems.
+The automated installer currently supports 64-bit Debian and Ubuntu systems.
-This includes Ubuntu running through WSL.
+This includes Ubuntu running through WSL. The modules can also be compiled
+manually on other Linux distributions.
 
 Native modules are tied to the operating system, CPU architecture, and PHP
 extension API. They should normally be compiled on the machine where they will
 run.
 
-## Build Requirements
+## Debian And Ubuntu Requirements
 
 ```bash
 sudo apt update
@@ -29,7 +30,7 @@ sudo apt install -y \
   build-essential git pkg-config libssl-dev
 ```
 
-## Build
+## Automated Debian And Ubuntu Build
 
 ```bash
 chmod +x build-linux.sh install-linux.sh
@@ -44,7 +45,7 @@ This downloads and compiles:
 
 Building does not install or enable the modules.
 
-## Install
+## Automated Debian And Ubuntu Installation
 
 After a successful build:
 
@@ -83,6 +84,186 @@ sudo systemctl restart php8.3-fpm
 
 Use the PHP version installed on the server in the service name.
 
+## Manual Build On Other Linux Distributions
+
+Other distributions can use the same modules but may use different package
+names and PHP configuration locations.
+
+The following tools are required:
+
+- PHP CLI and the matching PHP development package
+- `phpize` and `php-config`
+- SWIG
+- CMake
+- Ninja
+- Git
+- A C and C++ compiler
+- Make
+- OpenSSL development headers
+- `pkg-config`
+
+The PHP development package must match the PHP installation that will load the
+modules. For example, an extension built for PHP 8.3 should not be loaded into
+PHP 8.4.
+
+### Fedora, RHEL, Rocky Linux, And AlmaLinux
+
+Package names vary between system repositories and third-party PHP
+repositories, but a typical installation is:
+
+```bash
+sudo dnf install \
+  php-cli php-devel \
+  swig cmake ninja-build \
+  gcc gcc-c++ make git pkgconf-pkg-config openssl-devel
+```
+
+### Arch Linux
+
+```bash
+sudo pacman -S --needed \
+  php swig cmake ninja \
+  base-devel git pkgconf openssl
+```
+
+### Alpine Linux
+
+The exact PHP development package includes the installed PHP version on some
+Alpine releases:
+
+```bash
+sudo apk add \
+  php php-dev \
+  swig cmake ninja \
+  build-base git pkgconf openssl-dev
+```
+
+Confirm the required PHP build commands exist:
+
+```bash
+php --version
+phpize --version
+php-config --version
+swig -version
+```
+
+### Build liboqs
+
+Choose a working directory:
+
+```bash
+mkdir -p contractless-php-build
+cd contractless-php-build
+```
+
+Download and compile a minimal liboqs containing the fixed-size Falcon
+algorithm used by Contractless:
+
+```bash
+git clone --depth 1 https://github.com/open-quantum-safe/liboqs.git
+
+cmake -S liboqs -B liboqs/build -GNinja \
+  -DBUILD_SHARED_LIBS=OFF \
+  -DOQS_BUILD_ONLY_LIB=ON \
+  -DOQS_MINIMAL_BUILD="SIG_falcon_padded_512"
+
+ninja -C liboqs/build
+```
+
+Do not substitute `Falcon-512`. Contractless requires
+`Falcon-padded-512`, which produces fixed 666-byte signatures.
+
+### Build The Contractless liboqs-php Module
+
+Clone the PHP wrapper:
+
+```bash
+git clone --depth 1 https://github.com/Muzosh/liboqs-php.git
+```
+
+Apply `oqsphp-contractless.patch` from this repository:
+
+```bash
+cd liboqs-php
+git apply /full/path/to/Contractless-PHP-Modules/oqsphp-contractless.patch
+```
+
+Build the PHP extension against the liboqs copy compiled above:
+
+```bash
+LIBOQS_ROOT="$(cd ../liboqs && pwd)" bash build.sh
+cd ..
+```
+
+The resulting module is:
+
+```text
+liboqs-php/build/oqsphp.so
+```
+
+### Build The Skein Module
+
+```bash
+git clone --depth 1 https://github.com/jedisct1/PHP-Skein-Hash.git php-skein
+cd php-skein
+phpize
+./configure
+make
+cd ..
+```
+
+The resulting module is:
+
+```text
+php-skein/modules/skein.so
+```
+
+### Install The Modules Manually
+
+Find the extension directory used by the active PHP installation:
+
+```bash
+php-config --extension-dir
+```
+
+Copy both modules into that directory:
+
+```bash
+sudo install -m 0755 \
+  liboqs-php/build/oqsphp.so \
+  "$(php-config --extension-dir)/oqsphp.so"
+
+sudo install -m 0755 \
+  php-skein/modules/skein.so \
+  "$(php-config --extension-dir)/skein.so"
+```
+
+Find the PHP configuration files:
+
+```bash
+php --ini
+```
+
+Add these lines to the appropriate `php.ini` or extension configuration file:
+
+```ini
+extension=skein.so
+extension=oqsphp.so
+```
+
+CLI PHP, Apache, and PHP-FPM can use different configuration directories. The
+modules must be enabled for every PHP runtime that uses
+`php-contractless-rpc`.
+
+Restart Apache or PHP-FPM after changing its configuration. Service names vary
+by distribution and installed PHP version.
+
+Verify the manual installation:
+
+```bash
+php -m | grep -E '^(skein|oqsphp)$'
+```
+
 ## Compatibility Test
 
 The compatibility test proves that PHP and Contractless Rust produce matching
@@ -112,3 +293,4 @@ $digest = skein_hash($data, 256);
 Direct Contractless Falcon handling requires the public-key SHAKE256 prefix and
 raw-message marker. `php-contractless-rpc` applies that format automatically,
 so application developers should use its `NativeCrypto` class.
+