You will find detailed installation instructions in the ECL manual
       https://common-lisp.net/project/ecl/manual/pr01s06.html
If you do not have access to the online version, follow the following recipies.

* Unix and similar platforms.
  1. Type
     ./configure --help
     to get a list of the flags with which ECL can be configured.
  2. Enter
     ./configure ...
     where "..." is the set of flags you have chosen.
  3. Use "make" followed by "make install" to build and install ECL.

* Windows with Visual Studio C++ 2008
  1. Enter the msvc directory
  2. Read the file Makefile to find the configuration options. They typically have the
     form ECL_UNICODE=1, ECL_THREADS=1, etc
  3. Enter
     nmake ...
     followed by zero or more of those options
  4. Use "nmake install" to create a directory called "package" with ECL in it.
  5. Move that directory wherever you need.

* Cross-compile for the android platform (from the UNIX machine)
  1. Build the host ECL
     #+BEGIN_SRC shell-script
     ./configure ABI=32 CFLAGS="-m32 -g -O2" LDFLAGS="-m32 -g -O2" \
            --prefix=`pwd`/ecl-android-host \
            --disable-longdouble \
            --enable-libatomic=included
     make -j9
     make install
     rm -r build
     export ECL_TO_RUN=`pwd`/ecl-android-host/bin/ecl
     #+END_SRC
  2. Build the toolchain (requires android-ndk) and export the
     necessary paths - if you have a toolchain for the android just
     export it's bin/ directory
     #+BEGIN_SRC shell-script
       export PLATFORM_PREFIX=/opt/toolchains/android-ndk/
       export NDK_PATH=/opt/android-ndk/
       export NDK_PLATFORM=android-4

       mkdir ${PLATFORM_PREFIX}
       ${NDK_PATH}/build/tools/make-standalone-toolchain.sh \
                  --platform=${NDK_PLATFORM} \
                  --install-dir=${PLATFORM_PREFIX} \
                  --arch=arm

       export PATH=${PLATFORM_PREFIX}/bin:${PATH}
    #+END_SRC
  3. Build and install the target library
     #+BEGIN_SRC shell-script
       ./configure --host=arm-linux-androideabi \
                   --prefix=`pwd`/ecl-android \
                   --with-cross-config=`pwd`src/util/android.cross_config \
                   --disable-soname
       make -j9
       make install
     #+END_SRC
  4. Library and assets in the ecl-android directory are ready to run
     on the Android system.